A more thorough explanation:

A donator is a person who gives a gift or makes a donation.

• John was a generous donator to the local food bank.
• The university received a large donation from an anonymous donator.
• She became a regular donator to the charity after seeing the impact of her first donation.

These examples illustrate how a donator is someone who gives a gift or makes a donation. In the first example, John is described as a donator because he gives to the local food bank. In the second example, the anonymous person is referred to as a donator because they made a large donation to the university. In the third example, the woman is called a donator because she regularly gives to the charity.