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WE input is typically designated as clock input, since it is often controlled by a clock circuit that synchronizes several latch circuits with each other.
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The output can only change state while clock input is 1.
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When clock is 0, the S and R inputs have no effect.
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See also:
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If WE is momentarily asserted, (set to 1), either R or S will be set to 0, depending on the current value of D:
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if D=1, then S=0, causing the latch to change to 1.
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if D=0, then R=0, causing the latch to change to 0.
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Once WE returns to 0, both S and R return to 1, and the value stored in the latch will persist.