Much of your day-to-day lives running projects will be significantly impacted by your organizational processes and the culture of your organization. That could be based on your industry, what regulatory compliance is necessary, or simply because of how your organization chooses to run things.
The biggest impact on how these processes evolve is based mostly on how your organization is structured. Some structures are better than others for projects and sometimes trying to implement new best practices can be a bit painful due to your organizational influences.
I often look at organizational processes as the handbook of how they do things at an organization. The rules, best practices, and set processes. The enterprise environment is when you go to lunch with someone and they tell you how it really is! The organizational culture, the software...