Before you study about what is a Quadrilateral you are advised to read
What is a Polygon ?
"Quad" means Four, so a polygon which have 4 Angles, 4 Sides and 4 Vertices is known as Quadrilateral.
In the Above diagram :-
Quadrilateral ABCD has
4 Sides - AB, BC, CD and DA
4 Angles - ABC, BCD, CDA and DAB
4 Vertices - A, B, C and D
In the Above diagram :-
Quadrilateral PQRS has
4 Sides - PQ, QR, RS and SP
4 Angles - PQR, QRS, RSP and SPQ
4 Vertices - P, Q, R and S
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