They are called "programs", not "apps". The word "app" was created for the iPhone and originally meant a "mini" slimmed down application meant for mobile devices, not a catch-all term for any user program running on a CPU.
To add, you could have looked this up before posting a hostile comment on a relative newcomer's post. This is how linux communities develop reputation of being exclusive & unfriendly.
Way to out-pedantize a pedant. Also, wikipedia isn't exactly a credible source. While I wouldn't personally split hairs on the use of "app", TimeSquirrel isn't wrong in that the use of that short-form wasn't ubiquitous until the time of smart-phones, and more specifically, the iPhone.
And stuff like this is why Linux communities get a bad rep lol. No one cares that the the term all only came along with the iPhone, it's a common term now so get used to it.