What is a jerund?

Answer 1

See "gerund" if you are looking for something that has to do with the English language and/or linguistics.

Answer 2

It seems like you might be referring to a "gerund," which is a verb form ending in "-ing" that functions as a noun in a sentence. Gerunds are created by adding "-ing" to a verb base form and can be used as subjects, objects, and complements in a sentence.