Present continuous tense, also known as the present progressive tense, is used to describe actions currently happening or ongoing. It is formed using the auxiliary verb "to be" (am, is, are) followed by the present participle of the main verb, typically ending in -ing. This tense is often employed for actions occurring at the moment of speaking or for future plans and arrangements. It can also indicate temporary actions or situations and describe trends or repeated actions in the present. Additionally, it is used to express annoyance with actions using adverbs like "always."