What is a String?

A string is a sequence of characters, typically used to represent text. In programming, strings can include letters, numbers, symbols, and even spaces. For example:

Strings are one of the most common data types used in programming for storing and manipulating textual information.

What is the Use of Case Conversion?

Case conversion refers to changing the capitalization of letters in a string. It includes operations like:

• Uppercase Conversion: Changing all characters in a string to uppercase (e.g., "hello" → "HELLO").
  Use Case: Standardizing input (e.g., for usernames, emails).
• Lowercase Conversion: Changing all characters to lowercase (e.g., "HELLO" → "hello").
  Use Case: Case-insensitive comparisons, like in search engines.
• Title Case Conversion: Capitalizing the first letter of each word (e.g., "hello world" → "Hello World").
  Use Case: Formatting titles or headings.
• Toggle Case Conversion: Switching the case of each letter in a string (e.g., "HeLLo" → "hEllO").
  Use Case: Stylized text, testing string manipulation, or debugging purposes.

Case conversion is particularly useful in scenarios involving user input validation, data normalization, or creating visually appealing outputs.