Answer:
1. Classes and objects
2. Inheritance
3. Polymorphism
4. Data hiding/ encapsulation
5. Interfaces.
Explanation:
Classes and objects depict the major component of the OOP (object oriented programming). It explains the object like a ball in a soccer game development.
The inheritance is like the subclass of the object. Data hiding is a stage in oop where the codes or data are hidden from another users.
In the polymorphism stage, the object is given the ability to change to a sub-object, while in the interface stage a function or method signature is defined without implementing it.
HTML: Hyper Text Markup Language.
HTML is the markup language used for defining the structure, and very basics of a web page - one wouldn't be possible without this language!
HTML is combined with CSS (Cascading Style Sheet) to improve visuals, and combined with a language such as Javascript to add functionality and interaction with the web page.
Explanation: Well the first one was Plankalkül, but it wasn't implemented untill 1998. But the first to be actually used was Short Code.
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