What is Database? What is SQL and How it's Working?

Q1. What is Database?
Database is a systematic collection of data. Databases support storage and  manipulation of data. Databases make data management easy. Let's discuss few examples.
An online telephone directory would definitely use database to store data pertaining to people, phone numbers, other contact details, etc.
Your electricity service provider is obviously using a database to manage billing , client related issues, to handle fault data, etc.
Let's also consider the facebook. It needs to store, manipulate and present data related to members, their friends, member activities, messages, advertisements and lot more
Q2. What is SQL and How it's Works?
SQL is a domain-specific language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system. It is particularly useful in handling structured data.
In another words "SQL stands for Structured Query language, pronounced as "S-Q-L" or sometimes as "See-Quel". SQL is the standard language for dealing with Relational Databases. SQL can be used to insert, search, update and delete database records. SQL can do lots of other operations including optimizing and maintenance of databases. Relational databases like MySQL Database, Oracle, Ms SQL server, Sybase, etc uses SQL." 

The definition  of Microsoft is that "
As a database server, it is a software products with the primary function of storing and retrieving data as requested by other software applications—which may run either on the same computer or on another computer across a network (including the Internet).