Microsoft Office 2021 for Windows is a one-time purchase version of Microsoft[SQ]s popular office suite. Unlike the subscription-based Microsoft 365, you buy it once and own it outright. It includes the classic applications :

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Word:

Word processing software for creating and editing documents.
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Excel:

Spreadsheet software for data analysis and calculations.
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PowerPoint:

Presentation software for creating slideshows.
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Outlook:

Email client and personal information manager (depending on the edition).
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OneNote:

Note-taking application (depending on the edition).
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Access:

Database management system (available in some editions).
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Publisher:

Desktop publishing software (available in some editions).

Key Differences from Microsoft 365:

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Pricing:

Office 2021 is a one-time purchase, while Microsoft 365 is a subscription.
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Updates:

Office 2021 receives feature updates only for security and bug fixes, not new features. Microsoft 365 gets continuous feature updates.
* Online Services:

Office 2021 has limited online services integration compared to Microsoft 365.
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Collaboration features:

Microsoft 365 has more robust real-time collaboration features.


In short, Office 2021 is a good option for individuals or businesses who prefer a one-time purchase and don[SQ]t need the continuous feature updates and online collaboration features of Microsoft 365. However, Microsoft 365 generally offers better value over the long term if you need the latest features and ongoing support.