Application Integration refers to the process of connecting different software applications to work together seamlessly. This allows data and functions from one application to be shared and utilized by another, improving efficiency and productivity. For example, integrating a Customer Relationship Management (CRM) system with an email marketing platform enables businesses to manage customer interactions more effectively. There are various methods for achieving application integration, including API (Application Programming Interface) connections, middleware, and data integration tools. These methods help ensure that information flows smoothly between applications, reducing manual data entry and minimizing errors. Ultimately, application integration enhances overall business operations and decision-making.