Definition: IsAPI stands for "Internet Service Application Protocol". It's a standard used to communicate between websites, servers, devices, and browsers. Here's its definition: IsAPI is a protocol that allows communication between various types of applications on the internet. It specifies how websites and other Internet resources (such as web pages) should respond to requests from clients or devices on their systems. In essence, it defines rules for how applications can connect with one another and communicate using HTTP. IsAPI provides guidelines for defining how networks are structured, how information is shared between different services, and how the internet operates internally.