1.Diff between Compiled Lang Vs Interpreted Lang Vs Declarative Lang?

Compiler Lang : A compiled lang is a programming lang whose implementations are typically compilers (translators that generate machine code from source code), and not interpreters (step-by-step executors of source code, where no pre-runtime translation takes place).

Interpreted lang : Interpreted lang is a programming lang which are generally interpreted, without compiling a program into machine instructions. It is one where the instructions are not directly executed by the target machine, but instead read and executed by some other program.

Declarative lang : also called nonprocedural or very high level, are programming lang in which (ideally) a program specifies what is to be done rather than how to do it.

2.Example of Declarative Lang?

SQL and Prolog

3.Pros and Cons of Declarative Lang?

pros : Short, efficient code

cons : Sometimes hard to understand for external people