The Present Continuous tense is used to describe actions that are happening right now or ongoing activities. It is formed using the verb "to be" (am, is, are) followed by the base form of the main verb with an "-ing" ending. For example, in the sentence "She is reading a book," the action of reading is currently taking place. This tense can also express future plans or arrangements. For instance, "They are meeting their friends tomorrow" indicates a scheduled event. The Present Continuous helps convey immediacy and ongoing action, making it a useful tool in everyday communication.