Where does CoinGecko get its data?

Could you please clarify the source of CoinGecko's data? I'm curious to know how they ensure the accuracy and reliability of the information they provide to users. Do they collect their data from a single source or multiple ones? And if it's the latter, how do they ensure consistency and avoid any discrepancies? Furthermore, are there any measures in place to verify the authenticity of the data before it's made available to the public? I'm interested in understanding the processes behind their data collection and validation in more detail.