REST APIs are a common, understandable way for applications to exchange information. They help separate systems by responsibility, which is useful when a portal, mobile app, internal tool, and third-party platform all need to work together.
When systems need to share data without becoming tangled
Direct database access and ad hoc file exchanges make ownership unclear and failures hard to trace. As integrations grow, a business needs defined rules for who provides data and how changes are handled.
Explicit contracts between systems
A REST API exposes a deliberate set of actions and data for other systems to use. We define authentication, permissions, validation, versioning, and failure responses so integrations remain understandable as they grow.