A gerund is a noun formed from a verb by adding the suffix "ing". The following are all gerunds:
swimming / running / drinking
Although a gerund is a noun, it can still take an object (like a verb). This is known as a gerund complement.
Playing the guitar is easier than it seems.
gerund (gerund complement)
Gerunds look identical to present participles (adjectives formed from verbs).
Running the tap will clear the air pocket. (gerund, i.e., a noun)
Can you fix the running tap? (participle, i.e., an adjective)
What are nouns?
The different types of nouns
What are pronouns?
The different types of pronouns
Non-countable nouns (mass nouns)
Click on the gerund: