Gerund(-ing)

When a verb ends in -ing, it may be a gerund or a present participle. It is important to understand that they are not the same.
When we use a verb in -ing form more like a noun, it is usually a gerund:

• Fishing is fun.

When we use a verb in -ing form more like a verb or an adjective, it is usually a present participle:

• Anthony is fishing.
• I have a boring teacher.

Gerunds are sometimes called "verbal nouns".