Timeframe
A timeframe is how much time one candle on the chart covers.
M1 is one minute per candle, H1 is one hour, D1 is one day. The same market looks calm on one and violent on another.
The timestamp on a candle is the time it opened, in the broker's clock, not yours.
Also called: M1 M5 H1 H4 D1
Related terms
A definition, not financial advice. Trading carries a risk of loss.