Define Bitcoin for me

What's the point of this?
Why would he take our word over the many available and reliable resources about bitcoin and other crypto currencies?

https://en.wikipedia.org/wiki/Bitcoin
https://en.wikipedia.org/wiki/Cryptocurrency

"A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange that uses cryptography to secure its transactions, to control the creation of additional units, and to verify the transfer of assets."