An App Builder is a software tool that allows users to create mobile or web applications without extensive programming knowledge. These platforms often provide a user-friendly interface with drag-and-drop features, enabling individuals or businesses to design apps tailored to their needs. Many App Builders come with pre-built templates and components, making it easier to add functionalities like forms, databases, and user authentication. Popular examples include Appy Pie, Bubble, and Adalo, which cater to various industries and purposes, from e-commerce to social networking.