Variables are like containers that store data values. You assign a value to a variable using the assignment operator (=). Example: age = 30, name = "Alice"

Naming Rules & Best Practices:

• Must start with a letter (a-z, A-Z) or an underscore (_).
• Can be followed by letters, numbers, or underscores.
• Case-sensitive (age is different from Age).
• Cannot be a Python keyword (like if, for).
• Use descriptive names (e.g., user_age instead of x). Snake case (my_variable_name) is common in Python.