The term "multiple platforms" refers to the ability for a software or application to be used across different types of devices, operating systems and/or browsers. This means that the program can run on various computer systems such as Windows, MacOS, Linux, Android, iOS, etc., and is compatible with multiple web browsers like Google Chrome, Mozilla Firefox, Safari, Microsoft Edge, etc. The phrase "multiple platforms" emphasizes flexibility, accessibility, and compatibility of software or applications that are designed to work seamlessly across different devices and systems.