What is variable in programming?

 In programming, a variable is a named container that stores a value. It's like a box with a label on it, where you can put things inside and retrieve them later. Here's a breakdown of key concepts:

1. Naming a Variable:

• You choose a descriptive name to represent the data you'll store, making your code more readable.
• Common naming conventions involve using lowercase letters, numbers, and underscores (e.g., name, age, total_score).

2. Assigning a Value:

• You use the = operator to assign a value to a variable.
• Example: name = "Alice" puts the string "Alice" into the variable name.

3. Data Types:

• Variables hold different types of data:
  • Numbers (integers like 42, decimals like 3.14)
  • Strings (text like "Hello, world!")
  • Booleans (True or False)
  • More complex types like lists and dictionaries

4. Reusing and Changing Values:

• You can use a variable's name throughout your code to access and manipulate its value.
• Example: print(name) would output "Alice".
• You can assign a new value to a variable, effectively changing its contents.

5. Importance of Variables:

• Organize and manage data within programs.
• Make code more readable and maintainable.
• Perform calculations and operations on data.
• Store user input and create dynamic content.

Example (in Python):

Python

# Declare variables with different data types
age = 30
name = "Bob"
is_active = True

# Print the values to check
print(age)  # Output: 30
print(name)  # Output: Bob
print(is_active)  # Output: True