A more thorough explanation:

An embezzler is someone who steals money or property that they were supposed to take care of. This is a crime called embezzlement. Embezzlers take money or property that belongs to someone else and use it for their own purposes. They do this even though they were trusted to take care of it.

For example, imagine that a bank teller takes money from the bank's cash register and puts it in their own pocket. This is embezzlement, and the bank teller is an embezzler. Another example is a company accountant who takes money from the company's accounts and uses it to buy themselves a new car. This is also embezzlement, and the accountant is an embezzler.

Embezzlers can be punished by law for their crimes. They may have to pay back the money they stole, and they may also go to jail.