An introduction is the beginning part of something that helps you understand what comes next. When you write a book report, your introduction tells readers what the book is about and what you'll be discussing. When you meet someone new, an introduction is when you learn each other's names and start a conversation.

Think of an introduction as a doorway into something larger. A movie's opening scene introduces the characters and setting before the main story unfolds. The first chapter of a novel introduces you to the world the author has created. A teacher's introduction to a new unit in math class explains what concepts you'll be learning and why they matter.

The word also means formally presenting one person to another. When your mom introduces you to her colleague at the grocery store, she's making sure you both know who the other person is. Good introductions help people feel comfortable and give them something to talk about.

You can also introduce a new idea, product, or invention. When smartphones were first introduced, they changed how people communicate. Scientists introduce new theories. Companies introduce new products. In these cases, introduce means bringing something new into existence or making it available for the first time.

The key idea behind all these meanings is that an introduction creates a starting point, whether for a conversation, an essay, a relationship, or an innovation.