Third-party integration refers to the addition of relevant external data to an existing project via various APIs. Because of third-party APIs, developers can create a new solution in a shorter time by repurposing existing components rather than writing new code from scratch. For example, if you want to make an app for ordering things online, you might include a chat feature. Rather than designing a new chat interface, engineers can incorporate an existing API into your application. However, if an app is designed with far too many third-party integrations, it may suffer from severe performance issues in the future.