I will forever recommend VoidTools' Everything ever since someone first introduced it to me some few years ago.
It indexes your entire filesystem and allows you to search for files by name (and by content for text files!) and even allowing RegEx searching for file names, and filters for certain file types and the like.
Everything is a godsend, I install it on every Windows machine I use. But it always makes me wonder why Microsoft doesn't integrate such search features in their own OS.
I don't know who down voted you, because Everything is really really good.
Quick as a nimble, it instantly finds anything on your drives.
My dear colleague bashed my ears for more than a year about this VoidTools soft before I begrudgingly installed it, lo and behold it's seriously one of the best tools I have ever stumbled upon.
At one point the software stopped working on my computer at work. I couldn't believe how many times I used it throughout the day without realizing it. My only issue is that it can't search network shares properly.
Its very strange, I'm still not convinced we all don't use downvote both punitively and in the curation-sense. I actually like to upvote things that are radically incorrect only if there's a compelling rebuttal existant
A lot of the time I need to go digging around in some of my old files from backups to find something (that I remember the file name of, but not the path), so it helps there.
It also helps when I need to find the path of something quickly, as I can just find it by name and use the "Copy as Path" context menu option directly from the results window.
... definitely helps as well when I can't seem to keep my files organised for too long and they get super cluttered quickly, skill issue on my part there.