TeamViewer is an all-in-one remote administration and collaboration tool. It enables users to remotely access and control other computers, mobile devices, and servers from any location. With TeamViewer, users can securely transfer files, access and share files, and even collaborate on projects in real-time. It also provides a range of features for IT professionals such as remote device management, remote support for customers, and remote access to a server or workstation. It is available for Windows, Mac, Linux, iOS, Android, and Windows Phone. Additionally, TeamViewer can be used for online meetings and video conferencing.