We use 'special' to say something is not like others. It is for one person or thing only. It can be a different or important thing.
This is a special gift for you.
She has a special place in my heart.
We say 'special' when something is made for one reason or event. It is not general but for a certain use or time.
This is a special menu for holidays.
They have special tools for this job.
'Special' as a noun means a show or event that is not regular. It is something extra or different from normal programs.
We watched a special on TV last night.
The school held a special for parents.
'Special' is used to talk about persons or things that get extra attention. These can have more rights or an important role.
She has a special job in the company.
Only special members can enter here.
In science or math, 'special' describes a case or condition that is different and important to study carefully.
A special case is studied in the test.
Special conditions apply in this formula.
'Special' as a noun can mean a good price or deal. Shops use this word to show discounts for a short time.
The store has a special this weekend.
I bought the phone on a special.
Sometimes people use 'special' as an adverb to mean 'especially' in a casual way. This is not formal English.
I like that movie special.
She looks special happy today.