Microsoft Office is a suite of applications designed to help with productivity and completing common tasks on a computer. You can create and edit documents containing text and images, work with data in spreadsheets and databases, and create presentations and posters. 

Each of the applications in Microsoft Office serves as specific knowledge or office domain such as:

1. Microsoft Word: Helps users in creating text documents.

2. Microsoft Excel: Creates simple to complex data/numerical spreadsheets.

3. Microsoft PowerPoint: Stand-alone application for creating professional multimedia presentations.

4. Microsoft Access: Database management application.

5. Microsoft Publisher: Introductory application for creating and publishing marketing materials.

6. Microsoft OneNote: Alternate to a paper notebook, it enables an user to neatly organize their notes.

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