There seemed some confusion in the download page comments, so maybe this will help a little? The product page for WinISO [ http://www.winiso.com/products/standard.html ] spells out pretty clearly what this decent app does & doesn't do.
An ISO image is basically all the raw data as it's found on an optical disc -- the concept is the same as the raw data, drive/partition image archives you get using Paragon, Acronis, EaseUS etc. backup software. WinISO will create an ISO file that you can then burn to disc using ImgBurn, Nero, Ashampoo Burning Studio & so on. It won't burn that ISO to disc -- only create it -- so while there are a good many practical reasons to use this feature, most of the time most people won't. One possible exception I believe is some games that need the disc loaded to play -- it can work well to create ISOs & mount the disc you want/need as you want/need it.
For whatever reasons ISO files are sometimes distributed on-line, e.g. the new win8.1 installation disc images. WinISO can mount ISO files in a fake [virtual] optical drive, so it's the same as if you burned the disc & opened it in your optical drive. That can be handy, though again it isn't something everyone is going to use -- I don't think most people have ever mounted an ISO image using WinISO or anything else. DVDFab has a free utility to mount ISO files that I use because it can be turned on/off, & like many people I've experienced problems in Windows with optical drive emulation software -- I've never used WinISO that way so I can't say whether its driver can cause problems or not [DVDFab Virtual Drive works for me, while maybe a dozen other apps won't, so I've never had a reason to try something else]. Win8 has the ability to mount ISO files built in.
There are a few different file formats that work the same as ISO files, the same way image backups from Acronis & EaseUS will appear different, even if they contain the same data. WinISO can switch or convert between seeveral disc image formats, so if you for example have a .nrg file from Nero, but don't have Nero, WinISO can convert it to something else you can burn. To be perfectly honest whenever I encountered something besides a ISO disc image file [& it was years ago] I just used whatever burning app would handle that type of image file -- I've never once converted from one format to another -- but I imagine the capability could come in handy if you were given some other format & didn't want to bother with anything more than the minimum necessary.
Finally, WinISO will let you edit ISO files. The most common use for this AFAIK is when you're working with Windows setup discs -- you can relatively easily change the contents, creating a new disc that [like the original] is bootable. And once again this isn't something most people will ever deal with. The last 2 times I edited an ISO was 1st to create a win7 install disc that wasn't version specific [you chose the version from a menu], & I created a win7 SP1 install disc by slipstreaming SP1 to a regular win7 setup disc. The only useful part about the universal install disc was you only have to keep track of one disc -- the 2nd, slipstreaming SP1, I wouldn't recommend because the process & tools were experimental.
Long story short, WinISO is the type of software that, like the *maybe* more well known Daemon Tools, can be handy to have around, but if you don't have something like it already, you most likely don't actually need it -- put another way, it doesn't let you do something you already do, only better, like say an image editing or drawing app, but provides a specific set of somewhat out of the ordinary functions, that only a handful of apps like WinISO can provide.
