Adjectives - English Grammar

Meaning : Adjectives is a describtive word. if you want to discribe anything then you should have to use "Adjectives".
like if i want to descibe my website, how should i describe it?
Jobgyaan is Fast.
Jobgyaan is faster than other websites
jobgyaan is the fastest website in the online learning web world.

so here we have describe this website as a "Fast" world which is obviously "Adjective" in simple words you can describe any details with Adjective words.

Usage of Adjectives

so as we know, Adjectives are words that describe or modify another person or thing in the sentence. The Articles "a, an, and the" are adjectives. Adjectives can tell the reader how much / how many of something you’re talking about, which thing you want passed to you, or which kind you want.

Types of Adjectives

remind down below quote for better understanding 

An adjective is a word or set of words that modifies or describes a noun or pronoun. Adjectives may come before the word they modify.

• Attributive adjectives
• Predicative adjectives
• Absolute adjectives
• Nominal adjectives