A more thorough explanation:

A quasi contract is a situation where there is an obligation to act as if there was a contract, even though the legal requirements of a contract have not been met. This type of contract is also known as an implied-in-law contract.

For example, if a person receives a service or benefit from another person, but there was no agreement or contract in place, a quasi contract may be created to ensure that the person who received the benefit compensates the other person for their services.

Another example of a quasi contract is when a person pays for a service or product, but the provider fails to deliver. In this case, the person who paid may be entitled to a refund or compensation, even though there was no formal contract in place.

These examples illustrate how a quasi contract can arise when there is an implied obligation to act as if there was a contract, even though the legal requirements of a contract have not been met.