And just to be that overly pedantic nit-picker, when most people refer to the "STL" today, they are really talking about the C++ Standard Library[1], which is related to and based on the conventions of the old-school Standard Template Library (STL), but a different thing. When you #include <vector> on most modern development platforms, you are not using the actual historic STL implementation.

1: https://en.wikipedia.org/wiki/C%2B%2B_Standard_Library