is a verb form which functions as a noun and ends in -ing
in do you mind my asking you?
A gerund phrase will begin with a gerund, an ing word, and might include other modifiers and/or objects. Gerund phrases always function as nouns, so they will be subjects, subject complements, or objects in the sentence, e.g.:
Eating ice cream on a rollercoaster can be a messy experience.
Eating ice cream on a rollercoaster = subject of the verb can be
Smoking is hazardous to your health.
Smoking = subject of the verb is.
Being a soldier requires being very fit
Being a soldier= subject of the verb requires.
being very fit = direct object of the verb require