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Hi  tanziyaashaq 
Thanks for sharing this overview on SQL. It's a nice, beginner-friendly summary of what SQL is and why it matters.
Just to build on it a bit for anyone new who check this post:

• SQL is typically grouped into a few sub-languages, which helps clarify what each command actually does:
• DDL (Data Definition Language) — CREATE, ALTER, DROP — defines the structure (tables, schemas, indexes).
• DML (Data Manipulation Language) — SELECT, INSERT, UPDATE, DELETE — works with the data itself.
• DCL (Data Control Language) — GRANT, REVOKE — handles the permissions/security piece you mentioned.

TCL (Transaction Control Language) — COMMIT, ROLLBACK, SAVEPOINT — manages transactions.

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A simple example:
CREATE TABLE Customers (

Id INT PRIMARY KEY,
Name VARCHAR(100),
City VARCHAR(50)

);

INSERT INTO Customers VALUES (1, 'Alice', 'Seattle');

SELECT Name, City
FROM Customers
WHERE City = 'Seattle';

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If anyone wanting to go deeper, the official docs are the best starting point:

• Microsoft SQL Server T-SQL reference
• PostgreSQL docs
• MySQL docs

Thanks 
Srikanth Cheri.