Vertical integration is when business is expanded through the vertical production line on one business. An example of a vertically integrated business could be Apple. Apple owns all their own software, hardware, designs and operating systems instead of relying on other businesses to supply these. By having a highly vertically integrated business this creates different economies therefore creating a positive performance for the business. Vertical integration is seen as a business controlling the inputs of supplies and outputs of products as well as the distribution of the final product. Some benefits of using a Vertical integration strategy is that costs may be reduced because of the reducing transaction costs which include finding, selling, monitoring, contracting and negotiating with other firms. Also by decreasing outside businesses input it will increase the efficient use of inputs into the business. Another benefit of vertical integration is that it improves the exchange of information through the different stages of the production line. Some competitive advantages could include; avoiding foreclosures, improving the business marketing intelligence, and opens up opportunities to create different products for the market. Some disadvantages of using a Vertical Integration Strategy include the internal costs for the business and the need for overhead costs. Also if the business is not well organised and fully equipped and prepared the business will struggle using this strategy. There are also competitive disadvantages as well, which include; creates barriers for the business, and loses access to information from suppliers and distributors.
For instance, you produce equipment of machines, you are doing a business-to-business space. It requires a different approach than business-to-consumer marketing because there several more steps involved in it. You need to find out the decision makers and find out ways to persuade them to business with you. to do this, you need to build a relationship with them by providing superlative services.
Personal selling involves an oral presentation given by a salesperson who approaches an individual or a group of potential customers. Personal selling allows for two-way communication and relationship building that can aid both the buyer and the seller in their goals. Personal selling is most commonly seen in business-to-business marketing (e.g.: selling machinery to a factory, selling paper to a print shop), but it can also be found in business-to-consumer marketing (e.g.: selling cars at a dealership). 
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)
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. Lesson-10: Instagram marketing step-by-step : Get 10,000 followers in 30 days | Ankur Aggarwal
It's critical that your marketing department uses their understanding and analysis of your business's consumers to offer suggestions for how and where to sell your product. Perhaps they believe an ecommerce site works better than a retail location, or vice versa. Or, maybe they can offer insights into which locations would be most viable to sell your product, either nationally and internationally. How To Start A Digital Marketing Agency With NO MONEY! ($0 - $10k/mo In 90 Days!!)