Which Software development process model is the most used by current companies? [closed]

Question

I have just completed my graduation in computer science.
Now I know about all software development process models i.e.

• Waterfall Model
• Spiral Model
• Iterative and Incremental Development
• Agile Development [I don't know much about this]

But I want to know which is used the most by new - current companies?
Is there any new model besides this, which is new and all don't know about it?

Answer 1

I'd say by far the most widely used method is the "make it work now, make it good later" (later as in, either after you no longer work there or the product dies).

Is this the best method? Absolutely not. But you asked for the most widely used one.