⚖️ や vs. と
Decide whether you are naming a set or giving examples from it.
Coco-sensei

Learn
Both particles connect nouns. と presents a complete list for the statement; や presents examples. Choose according to what you mean, not according to which particle is more polite.
と:
a complete list
や:
examples
犬 と 猫
a dog and a cat [the items being listed]
犬 や 猫
dogs, cats, and other animals
Which should I use?
- とAm I naming the whole set relevant here?と: these are the items in the list.
- や: these are among the items.Am I giving only some examples?
A “complete list” is limited by the conversation’s context. If you are naming what you are ordering now, と joins the items in that order. Use や when you are giving examples, such as drinks you enjoy.
Examples
本 と ペン を 買います。
I’m buying a book and a pen.
本 や ペン を 買います。
I’m buying books, pens, and other things.
コーヒー や お茶 が 好き です。
I like drinks such as coffee and tea.