An example of something de facto is a rule that people always follow even though it is not an official procedure, a defacto procedure.
An example of something de facto is a person who functions as a parent even though they are not related to the child, a defactor parent.
De facto segregation; a de facto government.
A de facto government.
Although the United States currently has no official language, it is largely monolingual with English being the de facto national language.
An example of de facto used as an adverb is in the phrase "de facto listening" which means actually listening.