While there ARE some tools that require a more invasive "installation" process (e.g., VMWare Fusion), the overwhelming majority of Mac software is installed by just dragging the application bundle into /Applications.
(App bundles are just special directories, more or less, so you're moving more than just the file, but it presents as a single thing.)
To remove an app, you just drag that bundle into the trash.
This usually DOES leave behind things like local user data or preference files, but those are inert text files and don't impact perf or machine behavior in the long run. Users typically waste more space on cat pictures.
The tl;dr is that "installers" and "uninstallers" only exist because Windows needs them. I have seen MANY MANY FOLKS come to the Mac and be VERY confused by this. "But you NEED an installation process! This can't work!" Nope. Windows needs an installation process.
I joked, in the 90s, that despite all the monopolistic chicanery from Redmond, their real lasting awful legacy would be the degree to which they lowered people's expecations about how computers worked, and I stand by that.
(Something else not needed on sane systems: "clean up" software. If you don't litter the file system with files when you add a program, you don't need special utilities to run that shit down and delete it later.)