What does connaissent mean?

"Connaissent" is the third-person plural present tense form of the French verb "connaître", which means "to know" or "to be acquainted with".

Here are some examples:

* Ils connaissent bien Paris. (They know Paris well.)

* Les élèves connaissent leurs devoirs. (The students know their homework.)

* Nous connaissons cette chanson. (We know this song.)

Note: "Connaître" is used for things that are known through experience or familiarity, while "savoir" is used for factual knowledge or information.