Organizations use Microsoft SharePoint to create websites. You can use it as a secure place to store, organize, share, and access information from any device. All you need is a web browser, such as Microsoft Edge, Internet Explorer, Chrome, or Firefox. Want to learn more? Get started with SharePoint.
https://support.microsoft.com/en-us/office/what-is-sharepoint-97b915e6-651b-43b2-827d-fb25777f446f
When you sign in to Microsoft 365, or your organization’s corporate SharePoint Server site, click SharePoint or Sites in the app launcher navigation or top bar. These are your entry points into SharePoint.
In the several years I’ve been working in the Microsoft SharePoint and Office 365 space, I’ve often come across people from my former techie years who have been in IT for decades but never even heard of SharePoint.
https://www.avepoint.com/blog/sharepoint-hybrid/what-is-sharepoint