SDKs (software development kits) are essential tools for developers, allowing them to integrate third-party features into their applications without reinventing basic functionalities. They include prewritten code, libraries, and documentation, which facilitate the creation of applications by enabling access to features not otherwise available. SDKs often rely on APIs (application programming interfaces) to define the communication between an app and a service, although SDKs are broader in scope, offering tools and resources specific to a platform and usually tailored to a particular programming language. Examples of SDKs include those from Freshteam, FreshBooks, Asana, Zoho CRM, SendGrid, and Box, each offering unique functionalities such as enhancing customer experience, boosting operational efficiency, and unlocking new revenue streams. Meanwhile, Merge provides a unified API that allows developers to manage multiple integrations through a single SDK, streamlining the process and saving time.