APIs (Application Programming Interfaces) facilitate software integration by enabling different applications to communicate and share data effectively. APIs define the methods and data formats that applications can use to request and exchange information, streamlining interactions between disparate systems. They allow developers to incorporate functionality and data from other services into their applications, enhancing their capabilities without needing to build everything from scratch. By promoting modularity and interoperability, APIs play a pivotal role in modern software development, driving innovation and efficiency in creating new solutions.