The Apache License is recognised by the Open Source Initiative as a popular and widely deployed licence with a strong community. All of The Apache Software Foundation’s projects, including the Apache HTTP Server project whose software powers more than half of the Internet’s web servers, use this licence. Consequently the licence is widely deployed even though it is used by only about two percent of the open source-licensed projects on the software repository Sourceforge. It is an interesting licence to compare with the Berkeley Software Distribution (BSD) licence, which it resembles in some ways. This document attempts to draw together the main features of the Apache License into a friendly and comprehensible digest, and in addition to note some details about its history and usage.