A more thorough explanation:

Definition: A foundling is a baby or young child who has been abandoned and found without any known parents or guardians.

Example: The police found a foundling on the doorstep of the local church.

Explanation: This example illustrates the definition of a foundling as a baby who has been abandoned and found without any known parents or guardians. The baby was left on the doorstep of the church, indicating that the parents or guardians did not want to be identified or responsible for the child.