It’s called a “paging file” now days. If you want to know where you’re is at, and it’s size, look up:
system properties - advanced tab - performance options. go into “change” and it’s all spelled out. At install, windows sets this to different min and max sizes, depending on the RAM that is in the system at the time. If you have ample HD space, set it as high as you like, but I highly recommend changing the sizes to min=max. If you have abuundant RAM, it doesn’t much matter where you put it. The size is also irrelevant to performance as long as min=max.
Many state that it should be 1.5 x RAM, but this is not really true unless you intend to analyze memory dumps after a crash. In fact, I suggest you disable the memory dump function, (also on the advanced tab, “startup and recovery”. This will waste HD space as it saves to a file on your root directory that can be hundreds of MB in size, as it serves no real purpose.
So anyway, make your paging file 1000MB to 1500MB if you have the space, 500MB may well be adequate if you have 500MB or more of RAM. Windows will inform you if you run out of space. in the paging file.