For most of us, our router is the DSL / Cable / Fiber “box” given to us by our ISP.
You can, of course, add your own home router in between your home network and your ISP’s box. This provides an extra level of safety – among other things.
Those of us who are a bit more techie (and crazy) like to roll our own router. There are many reasons for this, not the least of which is security.
Unfortunately, not all routers are created equal, even when they’re “created” by you!