Slideshare, YouTube, Scribd, Picasa, Google Drive, and Just Cloud are cloud storage services that allow users to store and share various file types online. They provide secure storage of documents, photos, videos and other important files. Users can access their files from any device as the files are stored on the service's servers. Registering for these services is simple and usually involves creating an account with a username and password. Once registered, users can upload files to the services to back up and organize important documents and multimedia files in the cloud.