2.7.4: Dynamically Types vs Statically Typed

I just don't get the difference between these two.

First, remember what a type is when we're talking about variables.

A variable's type refers to the type of data it stores - is it a float, an integer, or a string, for example?

When we're comparing dynamically vs statically typed languages, then, we're wondering whether the variable's type is static (meaning it stays the same) or dynamic (meaning that it changes).

A dynamically typed language can change while it runs. You might be storing a string in the variable on line 4, but you're storing an integer in the same variable on line 12. A statically typed language is like the mountains around us: it remains the same throughout the whole program (the same type, at least).

If dynamically typed languages can do more, then, why use statically-typed languages at all?

The advantages of statically typed languages are that they're more stable. They perform better.