Dynamic Typing Explained

a is now of data type string. And the very fact that I'm able to do that, change a variable's data type by changing the content in that variable, this is what's known as dynamic typing.

a = 3
a = "Hello"

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a = (str)"Hello"

Python is a language that's quite unique because on one hand it is strongly typed, in the sense that it holds on to the data type of the variable
But the part where the language is dynamically typed is that even though it knows what type a variable is, it knows what type a function expects, you can also dynamically change the data type of any variable like this.
Python allows you to change the data type of a variable just by assigning it to a different type of value.
Dynamic typing is not a feature that's available in all programming languages. For example, languages like C or Java or Swift, you won't be able to do this. Once you create a variable and you give it a certain type of data, then it must forever hold on to that type of data.

Strong typing means that the type of a value doesn't change in unexpected ways. A string containing only digits doesn't magically become a number, as may happen in Perl. Every change of type requires an explicit conversion.
Dynamic typing means that runtime objects (values) have a type, as opposed to static typing where variables have a type.