This refers to how the product gets to the customer; the distribution channels and intermediaries such as wholesalers and retailers who enable customers to access products or services in a convenient manner. This third P has also sometimes been called Place or Placement, referring to the channel by which a product or service is sold (e.g. online vs. retail), which geographic region or industry, to which segment (young adults, families, business people), etc. also referring to how the environment in which the product is sold in can affect sales.  4 Principles of Marketing Strategy | Brian Tracy
This refers to the process of setting a price for a product, including discounts. The price need not be monetary; it can simply be what is exchanged for the product or services, e.g. time, energy, or attention or any sacrifices consumers make in order to acquire a product or service. The price is the cost that a consumer pays for a product—monetary or not. Methods of setting prices are in the domain of pricing science.  How To Start A Digital Marketing Agency With $0 Investment [Part 1]
During decline, demand for a good begins to taper off, and the firm may opt to discontinue the manufacture of the product. This is so, if revenue for the product comes from efficiency savings in production, over actual sales of a good/service. However, if a product services a niche market, or is complementary to another product, it may continue the manufacture of the product, despite a low level of sales/revenue being accrued. 
Marketing entails product development, market research, product distribution, sales strategy, public relations, and customer support. Marketing is necessary in all stages of a business's selling journey, and it can use numerous platforms, social media channels, and teams within their organization to identify their audience, communicate to it, amplify its voice, and build brand loyalty over time.
Companies and nonprofit organizations also use SMS or text messages to send information about their latest promotions or giving opportunities to willing customers. Political candidates running for office also use SMS message campaigns to spread positive information about their own platforms. As technology has advanced, many text-to-give campaigns also allow customers to directly pay or give via a simple text message.
Where did the marketing take place? This was a bit of a trick question, as the marketing was the entire process. By aligning Instagram, Google, and its own website around a customer-focused initiative, the company ran a three-part marketing campaign that identified its audience, created a message for that audience, and delivered it across the industry to maximize its impact.
Digital marketing poses special challenges for its purveyors. Digital channels are proliferating rapidly, and digital marketers have to keep up with how these channels work, how they're used by receivers, and how to use these channels to effectively market their products or services. In addition, it's becoming more difficult to capture receivers' attention, because receivers are increasingly inundated with competing ads. Digital marketers also find it challenging to analyze the vast troves of data they capture and then exploit this information in new marketing efforts.
Digital marketing channels and traditional marketing channels are similar in function that the value of the product or service is passed from the original producer to the end user by a kind of supply chain. Digital Marketing channels, however, consist of internet systems that create, promote, and deliver products or services from producer to consumer through digital networks. Increasing changes to marketing channels has been a significant contributor to the expansion and growth of the sharing economy. Such changes to marketing channels has prompted unprecedented and historic growth. In addition to this typical approach, the built-in control, efficiency and low cost of digital marketing channels is an essential features in the application of sharing economy.
The process of marketing is that of bringing a product to market, which includes these steps: broad market research; market targeting and market segmentation; determining distribution, pricing and promotion strategies; developing a communications strategy; budgeting; and visioning long-term market development goals. Many parts of the marketing process (e.g. product design, art director, brand management, advertising, inbound marketing, copywriting etc.) involve use of the creative arts.
The third and final stage requires the firm to set a budget and management systems; these must be measurable touchpoints, such as audience reached across all digital platforms. Furthermore, marketers must ensure the budget and management systems are integrating the paid, owned and earned media of the company. The Action and final stage of planning also requires the company to set in place measurable content creation e.g. oral, visual or written online media.
The marketing mix is a crucial tool to help understand what the product or service can offer and how to plan for a successful product offering. The marketing mix is most commonly executed through the 4 P's of marketing: Price, Product, Promotion, and Place. Carefully considering the marketing mix will enable a business to understand how it can differentiate its product or service and thus build a marketing strategy to drive sales.
The marketing orientation is the most common orientation used in contemporary marketing. It is a customer-centric approach that involves a firm basing its marketing program around products that suit new consumer tastes. Firms adopting a marketing orientation typically engage in extensive market research to gauge consumer desires, use R&D (Research & Development) to develop a product attuned to the revealed information, and then utilize promotion techniques to ensure consumers are aware of the product's existence and the benefits it can deliver. Scales designed to measure a firm's overall market orientation have been developed and found to be robust in a variety of contexts.
Social media is used to facilitate two-way communication between companies and their customers. Social media outlets such as Facebook, Twitter, Tumblr, Pinterest, Snapchat and YouTube allow brands to start a conversation with regular and prospective customers. Viral marketing can be greatly facilitated by social media and if successful, allows key marketing messages and content in reaching a large number of target audiences within a short time frame. Additionally, social media platforms can also house advertising and public relations content..
Marketing warfare strategies are competitor-centered strategies drawn from analogies with the field of military science. Warfare strategies were popular in the 1980s, but interest in this approach has waned in the new era of relationship marketing. An increased awareness of the distinctions between business and military cultures also raises questions about the extent to which this type of analogy is useful. In spite of its limitations, the typology of marketing warfare strategies is useful for predicting and understanding competitor responses.
From a model-building perspective, the 4 Ps has attracted a number of criticisms. Well-designed models should exhibit clearly defined categories that are mutually exclusive, with no overlap. Yet, the 4 Ps model has extensive overlapping problems. Several authors stress the hybrid nature of the fourth P, mentioning the presence of two important dimensions, "communication" (general and informative communications such as public relations and corporate communications) and "promotion" (persuasive communications such as advertising and direct selling). Certain marketing activities, such as personal selling, may be classified as either promotion or as part of the place (i.e., distribution) element. Some pricing tactics, such as promotional pricing, can be classified as price variables or promotional variables and, therefore, also exhibit some overlap.
The digital marketer usually focuses on a different key performance indicator (KPI) for each channel so they can properly measure the company's performance across each one. A digital marketer who's in charge of SEO, for example, measures their website's "organic traffic" -- of that traffic coming from website visitors who found a page of the business's website via a Google search. a REALISTIC Day in the Life (Entrepreneur & Digital Marketing Manager)