What are these and how are they useful?

Keywords, also known as reserved words, are predefined words in a programming language that have special meanings and are reserved for specific purposes. These words are part of the language's syntax and cannot be used as identifiers (variable names, function names, etc.) in the program.

Keywords are essential for programming languages because they provide the foundation for defining the structure, logic, and behaviour of programs. Here are some reasons why keywords are useful:

• Syntax and Grammar: Keywords define the syntax and grammar rules of a programming language. They dictate how statements, expressions, and program structures should be formed. By adhering to the predefined keywords, developers can write code that is valid and understandable by the language compiler or interpreter.
• Control Structures: Keywords are used to define control structures such as loops, conditionals, and function declarations. They allow programmers to control the flow of execution and create complex logic within their programs.
• Data Types and Declarations: Keywords are used to declare variables, constants, and data types in programming languages. They provide a way to specify the type and characteristics of the data being stored, such as integers, strings, arrays, and more.
• Object-Oriented Programming (OOP): In object-oriented programming languages, keywords like class, object, inheritance, and polymorphism define the fundamental concepts and mechanisms of OOP. They enable the creation of classes, objects, and the implementation of object-oriented principles.
• Accessibility and Modifiers: Keywords like public, private, protected, and static control the accessibility and visibility of variables, functions, and classes in object-oriented languages. They help in encapsulation, data hiding, and defining the scope of entities within a program.

Most Important keywords:

• if
• else
• for
• while
• switch
• case
• int
• float
• char
• void
• return
• break
• continue