You'll often hear the phrase "Flavor is free".
For example, take the spell Mage Armor. All it does is set your armor class to 13 + your dexterity modifier.
If I'm playing a wizard, I'll describe it as my character pulling the ink from their spellbook and throwing on themselves as inky armor.
Whereas if I'm playing a druid, I'll describe it as my character slamming their staff into the ground and vines wrap around their body to create the armor.
Both do the same thing, but are presented differently.



Wizard
Str. 8
Dex. 12
Con. 13
Int. 15
Wis. 14
Cha. 10