Microsoft OneDrive is a cloud storage service that allows users to store, sync, and share files and documents online. It enables users to access their files from any device with an internet connection and provides a range of features such as document collaboration, file sharing, and automatic backups. OneDrive is integrated with Microsoft Office Suite, which makes it easy for users to access and edit their documents from anywhere. It offers both free and paid plans with varying storage limits, making it a popular choice for individuals and businesses alike. OneDrive is available on multiple platforms, including Windows, Mac, iOS, and Android.