C/C++ is used almost everywhere today. Your laundry machine run's on a microprocessor receiving instructions written in C/C++, the same goes for the loads of other electronics you use.
Ever played the game GTA,COD,etc . Most of these games are written in C/C++. game engines such as unity,unreal etc requires C++ for awesome performance .
Google run's it"s distributed system logic on C/C++. Am sure you aere taken awe by the new wave of VR(virtual reality) such as Oculus,play station 4 vr etc , are written in C/C++ .
Chances are the operating system you used in asking this question on your PC is written in C, guess what happens when it is time to update the OS. more C/C++ code gets written.
Ever wondered how your laptop detects your printer and it works flawlessly,well someone had to write the drivers in C/C++
Most of high ranking competitive programmers use C/C++ because of the sheer speed of those languages.