A business analyst (BA) is a vital role in any company, they act as the bridge between the business (stakeholders) and IT. They are an information conduit, translating business language into a language IT understands. They decipher the future of the business, by identifying, creating and documenting changes and enhancements to the business process.

BAs play a key role in any organization by —

BAs decipher the future of the business, by identifying, creating and documenting changes and enhancements to the business process.
BAs speak both tech and business, they work with both teams to ensure a successful launch.
BAs drive change management, people adapt to change when slow and comfortable, a BA will work with the team to ensure they adapt the new solution.
BAs reduce project costs by reducing the rework that takes place.

When a project fails, most are tracked back to requirements and lack of research. BAs save time = money + adoption to all projects.