Adjectives are "describing words." They describe people and things, giving extra information about them.
We use the question word "Wie?" to ask for adjectives.
Short Answer: YES, sometimes!
When an adjective comes before the noun it describes, you have to change its ending.
This process of changing a word is called declension.
When an adjective comes before the noun, it's ending has to be changed (that is called declining the adjective). The new ending is determined by the article, case, and gender of the noun its describing.
Example: „Das ist ein schnelles Auto.“
We can use adjectives to make comparisons between nouns: something is faster, slower, better, worse, etc. than something else, or maybe it's the fastest , slowest, best, or worst of everything else. This page will teach you how to construct and use these forms.
Example: „Mein Auto ist schneller als dein Auto.“
We can change verbs into their present participle or past participle forms and use them as adjectives. This is done to describe what something has done or had done to it in a way that's quicker and more natural than explaining it with an phrase or sentence.
Example: „Das gebrauchte Auto ist hier.“
Adjectives and participles can also be used as nouns. They are usually used to describe people or abstract ideas. They are really nouns, but we change their endings like adjectives.
Example: „Ein Fremder klingelt an der Tür.“
In German you can create a lot of adjectives by adding prefixes or suffixes to nouns and verbs you already know. Unfortunately there aren't any general rules, but on this page I share some of the most common prefixes and suffixes, along with some examples.
Example: essen ⇒ „essbar“ ⇒ You can eat it (it's edible).