Bigger businesses will have their own marketing departments and their own people in charge of marketing output and strategy – so why might they need an agency? Many agencies will have their own specialisms that the business just won’t be able to have in-house, as it would be far too expensive. This could involve anything from SEO to copywriting to video.
When you run a business, you will put your marketing department in place to focus on the marketing strategy. Part of this strategy will be working with agencies to find the right services and generate results together. You can’t expect one department to do everything, especially creative work like branding and printing.
The other main benefit is the cost. It is almost always going to cost less than a full-time salary or department of salaries to outsource some of your marketing work. Choose agencies that are relevant to what you want to achieve.