Price action shows you what happened. Order flow shows you how it happened. The distinction gives every candle a second layer of context.
A candle that closed up 0.5% means something different if it was driven by a single institutional buyer accumulating at the ask versus thousands of small retail orders bouncing off a round number. Reading the tape — understanding the mechanics of bids, asks, and order flow — gives you context that candlestick charts alone don't provide.
Bid, ask, and what the spread tells you
The bid is the highest price a buyer is willing to pay right now. The ask is the lowest price a seller is willing to accept. Trades happen when these two sides agree — either a buyer lifts the ask (paying up, a sign of urgency), or a seller hits the bid (selling down, also a sign of urgency). Trades at the ask suggest buying pressure; trades at the bid suggest selling pressure. When more volume is printing at the ask than the bid, buyers are aggressive — and price tends to move up.
Volume clusters and large prints
Large prints — single trades significantly bigger than the average — can signal institutional activity. A 50,000-share print at the bid when the average trade is 200 shares is unusual; it may represent a block sale or an algorithmic execution. Volume profile tools show where most volume traded over a given period, revealing price levels where significant buyer-seller agreements occurred — these often act as support or resistance on subsequent tests.
The tape tells you who's in a hurry. Urgency is the signal. Price is just the result.
Reading the tape is a skill built slowly, through observation and journaling. Log unusual prints and volume patterns alongside your standard entry data, then review them in aggregate. Over time, you'll develop intuition for what normal order flow looks like in the instruments you trade — and when something is different.