A more thorough explanation:

Voluntary deposit refers to a deposit made by choice, without any legal obligation to do so. For example, if someone decides to deposit money into their savings account, it is a voluntary deposit because they are not required by law to do so.

Another example of voluntary deposit is when a person chooses to deposit money into a friend's account to help them out, without any legal obligation to do so.

These examples illustrate that voluntary deposit is a choice made by an individual, without any legal requirement or obligation to do so.