What is apache.?

Answer 1

PHP is a server-side language. It is being processed before you actually see a webpage (connection to Database, etc.). PHP works only with a server. Apache (frequently found in packages like XAMPP, etc.) makes it possible for you to run a local server on your own PC to make PHP work c:

Answer 2

Apache is a software foundation, participates in hundreds of open source projects
Like tomcat, ant, maven, en so on

Answer 3

HTTP server

Well no. Apache is an organisation, it's flagship product is an HTTP server.

Answer 4

There is even an Apache Open Source License