Middleware software allows two separate software applications to interact and share data. Middleware could also act as a software layer between an application and an operating system. This type of software usually supports distributed systems and facilitates messaging services, making application development easier for programmers. Middleware does not disclose the complex nature of distributed applications, and provides the uniform, high-end interfaces necessary for making applications reusable and interoperable. Features of Middleware software typically focus on transaction management, API management and messaging.