Do I have to do KYC?

Hi. He plans to set up an account on the exchange and buy some cryptocurrencies, starting with bitcoin. Wherever I try to open an account, it always says KYC. Have you had that too? What is this all about? What is all this KYC? They always ask for a scan of your ID or passport. How safe is it and is there any way to bypass it? Thank you in advance for your answer