An adjective always describes a noun. An adjective can give us information about:
quality: a delicious meal, an amazing experience
size: a short woman, a large house
age: an old tree, a middle-aged man
temperature: a cold winter, a hot chocolate
shape: a triangular flag, a rectangular box
color: a red scarf, a black-and-white film
origin: a Polish chocolate, an American cheeseburger
Adjectives often answer the question: what is …. like? and give either general or precise information:
What is Peter like? He's tall/handsome/blonde.
What is Mary like? She's mean/stupid/caring.
What is the bike like? It's beautiful/blue/squeaky.
What is the bike like to ride? It's easy/slow/fast.