Bitcoin was the first decentralized digital currency based on blockchain technology. It was created in 2008 by a mysterious and anonymous developer known as Satoshi Nakamoto, who released the white paper in a cryptography mailing list and later open-sourced the software that implements the protocol.
The Segwit address format is an improvement for the scalability of the legacy address format. SegWit comes with cheaper fees. SegWit addresses start with "bc1q", for example
The original Bitcoin format. This format has higher transaction fees than other formats. Legacy addresses start with "1", for example
This format comes with the latest bitcoin update, it is a soft fork that improves Bitcoin’s scripts to increase privacy, efficiency, and the network’s ability to process smart contracts. Taproot addresses start with "bc1p", for example