In plain English
What Moving average means
A simple moving average, or SMA, gives each included observation equal weight. An exponential moving average, or EMA, gives more weight to recent observations, so it generally responds more quickly to new prices. The period count can be minutes, hours, days, or another chart interval. Changing the price input, calculation method, or timeframe changes the indicator value.
Why it matters
Moving averages can summarize past price direction and are often used as reference lines in technical analysis. They are lagging calculations: the value depends on prices already observed. A crossover or price interaction may be interpreted as a signal by some traders, but it does not establish future direction, support, resistance, or a suitable trade size.
Example
The last five daily closing prices are 1.1000, 1.1020, 1.1010, 1.1030, and 1.1040. Their five-day SMA is 1.1020: the sum, 5.5100, divided by five. When the next close replaces the oldest one, the average moves with the new five-day window.
Quick answers
Common questions
What is the difference between an SMA and an EMA?+
An SMA equally weights all prices in its selected window. An EMA applies greater weight to more recent prices, which usually makes it respond faster to new price changes while still relying on historical data.
Does price crossing a moving average mean a trend has reversed?+
No. A cross can occur during a brief pullback, a sideways market, or a larger reversal. It is a chart event based on a lagging calculation, not proof that a directional change will persist.
Sources