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A variable in Python is a name that refers to a value stored in memory. Variables are used to store data of different types like strings, numbers, lists, etc. Here are some important things to know about Python variables: 1. Declaration: In Python, you don't need to declare variables explicitly. You can create a variable simply by assigning a value to it. Example: ``` a = 10 name = "John" ``` 2. Naming convention: Variable names in Python can contain letters, numbers, and underscores. They cannot start with a number. It is recommended to use lowercase letters for variable names. Example: ``` my_variable = 5 ``` 3. Data types: Python supports many data types like integers, floats, strings, lists, tuples, dictionaries, etc. When you assign a value to a variable, Python automatically assigns the appropriate data type to it. Example: ``` a = 10 # integer b = 3.14 # float c = "Hello" # string d = [1, 2, 3] # list e = {"name": "John", "age...