Class is a reference type with data and related functionalities encapsulated as a single unit. It serves as a blueprint for objects.

• It is declared using the class keyword.
• It contains data members like fields, properties, methods, and events.
• It can be declared either public or internal (internal is the default access modifier).
• Its members can be public, private or internal (members are private by default).
• Instance of a class or an object can be created using the new keyword.
• It can directly inherit only one base class.
• It can implement multiple interfaces.
• It has a base type of System.Object.

Example

namespace MyConsoleApp
{
    class Language
    {
        public string lang = "EN"; //Field
        public string Country { get; set; } //Property
        public virtual void Greeting() //Method
        {
            Console.WriteLine("Hello!");
        }
    }
}