Varchar
/ˈvɑɹt͡ʃɑɹ/
"Varchar" in a Sentence (2 examples)
Be aware that varchars will in general provide slower updates but faster selects. By definition, the amount of storage they use is variable.
With a varchar, the storage is always the actual number of characters you have stored plus 2 bytes. So a varchar(20) with a 5-character word will take up 7 bytes, with the extra 2 bytes holding a size reference for SQL Server.