Google Apps is a cloud-based productivity and collaboration suite that provides email, calendar, documents, sites and more through a web interface. It offers features like document creation and storage, site building, integration with third party apps, and access from any device. Google Apps is free for up to 50 users or $50 per user annually for businesses and includes security, backups, and support. It provides an alternative to Microsoft Office 365 for email, documents and collaboration in the cloud.