The key differences between IIS and Apache are:

• While Apache is open source and free, IIS is included with Windows.

• Apache can run on practically every operating system, including UNIX, macOS, and Linux, whereas IIS can only be used with Windows (Linux is best).

• IIS is connected with further Microsoft products like NET and ASPX.

• While Apache is supported by the user community, IIS has a helpdesk that handles the majority of difficulties.

• IIS is a more secure alternative to Apache due to its security features.

• IIS uses technology that is interoperable with widely used web interfaces.