Deep linking is a technique used in web and mobile applications that allows users to navigate directly to specific content within an app or website, rather than just the homepage. This is achieved by using a unique URL that points to a particular page or resource, making it easier for users to find what they are looking for without unnecessary clicks. In mobile apps, deep linking can enhance user experience by directing users to specific features or content, such as a product page in an e-commerce app or a specific article in a news app. This method can also improve engagement and retention by simplifying access to relevant information, ultimately benefiting both users and developers.