Short answer: an order block is the last candle (or small cluster of candles) before a strong move away from a price. Large orders were filled there, and price often returns to that zone before continuing — which makes it a level to watch, not a signal on its own.
Find a strong, fast move — several large candles in one direction that broke a swing. Look at the last candle in the opposite direction just before it started. Its range, from low to high, is the order block. A bullish block sits under price (the last down candle before a rally); a bearish block sits above price (the last up candle before a drop).
A big buyer rarely fills everything in one go. When price comes back to where they bought, they often add — and traders watching the same zone do too. That is why the first return to a fresh block often reacts.
They describe the same thing from two angles: a price where orders sit. Treat an order block like any other support or resistance zone — it matters most when it lines up with a swing level or the trend on the bigger timeframe.
Sylvo marks order blocks on its live market reads when they sit near price, with the zone drawn on the chart.
Very close. Supply and demand zones are usually drawn wider; an order block is the specific last opposite candle before the move. Both mark where orders were filled.
They exist on all of them, but blocks on higher timeframes (4-hour, daily) hold far more often than blocks on 1-minute or 5-minute charts.
Not on the touch alone. Wait for the close: a candle that rejects the zone and closes away from it is the confirmation.