When clients are looking for a particular service, they want as much evidence as possible to ensure the service provider they are hiring is the right choice. And while your branding, marketing, and content may initially be enticing, case studies (or customer success stories) are what seal the deal.
In marketing your company and its service offering, a case study explores the results of a service you provided to a client. These results are what exemplify the capabilities of your business — what it did for the client and what it can do for other clients facing a similar challenge.
The solution, the benefit, and the overall process are what evidence your expertise to potential clients so that they hire your business to solve their pressing issue.