Filestack is a cloud-based service that provides developers with tools to easily integrate file uploading, processing, and delivery into their applications. With Filestack, developers can simplify the process of uploading files to their applications by providing users with a simple and intuitive user interface that allows them to upload files from a variety of sources, including social media sites, cloud storage accounts, and local devices. Once the files are uploaded, Filestack provides developers with a variety of tools to process and manipulate the files, including cropping, resizing, and compressing images, as well as converting files to different formats. Finally, Filestack offers developers a fast and reliable content delivery network that ensures their files are served quickly and efficiently to users around the world. Overall, Filestack is a powerful tool that makes it easy for developers to add robust file handling capabilities to their applications.