[vekm]

С - is de facto just syntax sugar over Assembler.

Then in dev world arrived conception of Object Programming, that's how arrived C++ (plus-plus means "objects") and Obj-C (Obj also means "objects"). But both languages are far different. C++ became syntax sugar over C (and that's why everyone hate it), while Obj-C is marriage of Smalltalk with C. They use different conceptions and literally represent two different world.
Obj-C de facto used only on Mac platform. But what is cool, in Obj-C projects you at same time and code can use even C++, so it looks like Obj-C++. Really monster