A more thorough explanation:

Ex quasi contractu is a Latin term that means "from quasi-contract." It refers to a legal obligation that arises not from an actual contract, but from circumstances that create an obligation similar to a contract.

One example of ex quasi contractu is when someone provides goods or services to another person without a prior agreement or contract. In this situation, the person who provided the goods or services may be entitled to payment for their work, even though there was no formal contract in place.

Another example is when someone benefits from the actions of another person without their consent. For instance, if a neighbor hires a contractor to fix their roof, and the contractor accidentally damages the neighbor's property while working, the neighbor may be entitled to compensation for the damages, even though they did not agree to the work being done.

These examples illustrate how ex quasi contractu can create legal obligations that are similar to those created by actual contracts. Even though there was no formal agreement in place, the circumstances created an obligation for one party to compensate the other for their work or damages.