Many projects, including compilers, cloud storage systems, databases, game development, graphic designs, etc., are built using C++. C++ is also used for making 3D visuals projects, these projects require control over huge amounts of data efficiently, and C++ is one of the best choices for that.
C++ plays quite an integral role in modern times as many contemporary systems such as operating systems, web browsers, databases, etc. have C++ code in at least some part of their codebase. Moreover, C++ is quite useful in performance-critical areas because of its speed.
While C++ is commonly used for graphics-heavy software such as games, photo and video editing apps, browsers, C is more widely used for embedded devices and OS kernels.