Marketing is the process of teaching consumers why they should choose your product or service over those of your competitors, and is a form of persuasive communication. It is made up of every process involved in moving a product or service from your business to the consumer. Marketing includes creating the product or service concept, identifying who is likely to purchase it, promoting it, and moving it through the appropriate selling channels. There are three primary purposes of marketing: What Is Digital Marketing?
Positioning concerns how to position a product in the minds of consumers and inform what attributes differentiate it from the competitor's products. A firm often performs this by producing a perceptual map, which denotes similar products produced in the same industry according to how consumers perceive their price and quality. From a product's placing on the map, a firm would tailor its marketing communications to meld with the product's perception among consumers and its position among competitors' offering. 
Digital Marketing Channels are systems based on the Internet that can create, accelerate, and transmit product value from producer to a consumer terminal, through digital networks. Digital marketing is facilitated by multiple Digital Marketing channels, As an advertiser one's core objective is to find channels which result in maximum two-way communication and a better overall ROI for the brand. There are multiple digital marketing channels available namely;
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.
If your company is business-to-business (B2B), your digital marketing efforts are likely to be centered around online lead generation, with the end goal being for someone to speak to a salesperson. For that reason, the role of your marketing strategy is to attract and convert the highest quality leads for your salespeople via your website and supporting digital channels.
If you follow yoga instructors on Instagram you must have seen them promoting products of certain brands. It is clear that co-branding or affinity marketing represents a partnership between two businesses with similar interests. They aren’t competitors to each other. Hence, there is no fear of losing your customer base. Affinity marketing refers to creating a product with another business to boost its sales.
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. 
Research and testing: Before you can take your idea public, you should perform marketing research and testing. Marketing departments usually test new product concepts with focus groups and surveys to gauge consumer interest, refine product ideas, and determine what price to set. Researching your competitors can help you set an optimal price and generate ideas for positioning your brand in an existing market. What Is Digital Marketing? And How Does It Work?