glBindBuffer vs. glBindbufferARB
glBindBufferARB was defined in the OpenGL extension GL_ARB_vertex_buffer_object. That was in OpenGL version 1.4.
Starting with OpenGL 1.5, GL_ARB_vertex_buffer_object was accepted into the core OpenGL API and so glBindBufferARB became glBindBuffer. glBindBufferARB is still available and performs the same function as glBindBuffer. Yet, in source code, you have to be careful not to use glBindBuffer if your program is going to run on a GPU that only supports OpenGL 1.4. Otherwise, your program will crash.
I am stuck to using glBindBufferARB instead of glBindBuffer because Unity must run on systems such as the Intel GMA 950 which only supports OpenGL 1.4 on Linux. You may think that all is find when your code runs on a systems with OpenGL 2.0+, only to see it crash on a system with a lower version of OpenGL. So be careful!