比 is two people standing shoulder to shoulder, facing the same way — the very posture of comparison. Put two of anything side by side and 比 happens automatically.
比 builds the comparison grammar every learner needs by week three: A 比 B 大 (A is bigger than B) — no 'more/-er' needed, just 比 between rivals. 比如 is 'for example'; 比赛 is a competition — comparison formalized with referees. The scissors-hand ✌️ in photos is 比耶 ('doing the yeah'). China's exam culture runs on 比 — but so does every improvement: 比昨天好 (better than yesterday) is the only comparison this app asks of you.
Two figures side by side — COMPARED, one THAN the other.
The photo pose ✌️ is 比耶 'compare-yeah' — comparison even conquered the selfie.