This is the "Taskbar" in Windows 11, which has now achieved its final form as a 100% clone of the Dock that was introduced on Macs about 22 years ago (and in similar form on NeXTSTEP about 34 years ago).

https://media.hachyderm.io/media_attachments/files/111/156/444/785/901/295/original/2f3388df450b2c2b.jpg