What does it mean to quantize the lie algebra $su(1,1)$ into $U_q(su(1,1))$

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I'm trying to understand the quantized version of $su(1,1)$, $U_q(su(1,1))$ but am having difficulty. All of the material I could find online just jumps straight into the algebra relations. So, in particular, what does it mean to 'quantize' an algebra.