What is 'integration'?
Integration is the process of facilitating two or more systems to interact with each other in a more seamless fashion. You may (for example) have an existing system that you wish to build a mobile app to sit on-top of, passing data back into your main system via any available API’s (Application Programming Interfaces) or directly via data querying.
Part of this process would involve feasibility studies/work to ensure that the integrations can be made and maintained. Understanding the underlining data and structures is also key to this approach for streamlining business processes and improving efficiency within it.