What is a signage point?

What is a signage point? How often it appears, and who makes it?

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Each sub-slot in both challenge and reward chains is divided into 64 smaller VDFs - signage points.

The signage point is the end product of “T” in “PoST” (Time). Each signage point is a cycle for Chia farmers at which they get a new challenge. On each “cycle”, they check if they have any proofs and broadcast them to the network if they have, effectively farming a block.

More information here: 3.5 Signage Points and Infusion Points | Chia Documentation