SharePoint spaces is a web-based, immersive platform, which lets you create and share, secure and extensible mixed reality experiences.
Building a space is a lot like building a modern site — that is, you create the space and choose options such as structure, background, and theme. Add web parts for your 3D objects, 360° images and videos, 2D images and text, and more.
You can build one or more SharePoint spaces on a new or existing site. We recommend using communication sites because you have more screen real estate to work with, but it is also possible to build a SharePoint space in a team site. When you create a space, you choose options such as structure and background. Then add web parts for your 3D objects, 360° images, 360° videos, 2D images, and more.
To create a space, you must first activate it at the Site level. Go to Settings / Site Information/ View All site settings / Manage site features to activate the Spaces (preview) feature:

Once this feature is enabled, you can create a space on the same level as you create a page. So Space is NOT a web part but it is a more sort of special type of page.
Manual Steps:
- Go to the home page of the site where you want to build a space. If you don’t already have a site you want to use, you can create a new one.
- Activate the spaces feature if it is not already activated:
- At the top left of the site, select Settings
> Site information, and then select View all site settings.
- On the Site settings page, select Manage site features. Scroll down the page to Spaces, and then select Activate.
- At the top left of the site, select Settings
Using PnP Powershell
Enable-PnPFeature -Identity 1604b101-3328-4405-b7e0-54ce59b9d124 -Scope Web
Once the space feature is activated.
- On your site home page, select + New, and then select Space.
- Choose the type of space you’d like to create (you can change this later).

- Provide your space a Space name (required).
- Provide your space a Space description (optional).
- Select Create.
To get an idea about the SharePoint space, you can explore some of the samples here
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courtesy:
Technical Solutions Professional | Modern Workplace Architect Lead | Microsoft 365 | SharePoint | Power Platform | MS Teams | React
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