Introduction is the first part of any written work, speech, or presentation. It is used to introduce the main topic to the audience and provide a brief overview of the content. It usually contains a few sentences that set the tone and provide some context for the main body of the work. There are several types of introductions, including the hook, the thesis statement, and the bridge. The hook is an attention-grabbing sentence or two that introduces the topic in an interesting way. The thesis statement is a declarative sentence that states the main point or argument of the work. The bridge is a transition sentence or two that connects the introduction to the main body of the work.