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So, then what is a sine? what is cosine?

I was thinking like this: if sine is y on the cartesian plane then it is something raised or lowered and if cosine is x then it is something being moved left or right. Then if tangent is sine/cosine it must be...raised and lowered at the same time? if it is being raised and lowered on all sides, it is touching all sides..?

Also, does anyone know if sine, cosine, and tangent were created to do or solve something specific or was it just discovered? If I understand the first part of my question (what sine, cosine, and tangent all mean without a mathematical explanation) then this part will be answered.

I am sorry if this sounds really confusing, :uhh: