Particle - や - and
や is used to list multiple things without excluding anything not listed: 猫や犬は好きです (I like cats and dogs and others). The particle と is used to only list things where something applies to.
Note that it can't be used in combination with the particle が because that particle requires the subject to be well-defined.
Sample sentences
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音楽や映画が好きですか
Do you like music and movies?
