Bitcoin Improvement Proposal (BIP) is a design document for introducing features or information to Bitcoin. … This is the standard way of communicating ideas since Bitcoin has no formal structure. The first BIP (BIP 0001) was submitted by Amir Taaki on 2011-08-19 and described what a BIP is. Bitcoin Improvement Proposal (BIP) Source: Bitcoin list of BIPs
The following non-forking BIPs have been finalized.
There are three kinds of forks: Temporary 1), Soft 2), and Hard3). The following forking BIPs have been finalized.