Microsoft Office 2021 Home & Business for Mac is the latest version of Microsoft's productivity suite for Apple Macintosh computers. It includes a set of applications that are commonly used in business environments, including:

1. Microsoft Word: a word processing application that is used to create, edit, and format documents.

2. Microsoft Excel: a spreadsheet application that is used to create, edit, and analyze data.

3. Microsoft PowerPoint: a presentation application that is used to create, edit, and deliver slide presentations.

4. Microsoft Outlook: an email and calendar application that is used to manage emails, appointments, and contacts.

5. Microsoft OneNote: a note-taking application that allows users to organize notes and information in one place.

Microsoft Office 2021 Home & Business for Mac includes new features such as improved collaboration tools, better integration with cloud services such as OneDrive and SharePoint, and new design and formatting options for documents, spreadsheets, and presentations.

It is a one-time purchase product, meaning you only need to buy it once and you can use it for as long as you want. It is also available as a subscription-based service with additional features and benefits, known as Microsoft 365.