Convention

A convention is a way in which something is usually done.

There are coding conventions, which is the way the code is presented and should be shared among a or several teams.

There is also the concept of convention over configuration, where the common behaviors, also known as the convention, is used as default, and any unusual aspect must be configured.

Documentation

See also Convention over configuration and Principle of least astonishment.

Related : Configuration, Naming, Best Practices, Magic, Trailing Comma