EA (Expert Advisor) (เอ็กซ์เพิร์ต แอดไวเซอร์ / บอทเทรด)

An EA (Expert Advisor) is a small program that runs inside the MetaTrader 4 or MetaTrader 5 platform. It follows rules written in code. It can read price data, check conditions, and then open, modify or close trades without you clicking each time. You attach it to a chart, and it works on that symbol and timeframe.

A simple example

Imagine this rule:

• If the price closes above the 50-period moving average on EURUSD, buy 0.01 Lot.
• Set a Stop Loss 30 pips below the entry.
• Set a Take Profit 60 pips above the entry.

The EA checks this rule again and again and acts whenever it is met. On a typical USD account, 0.01 Lot of EURUSD is worth about $0.10 per pip. So the 30-pip Stop Loss risks about $3, and the 60-pip target aims for about $6.

Why it matters

An EA removes some emotion and can follow a plan consistently. It also needs the platform to stay running, so many people use a computer that stays on or a VPS.

Common beginner mistakes

• Thinking an EA guarantees profit. It only does what its rules say. If the rules are weak, it will lose automatically.
• Using it live without testing. Try it on a demo account first. Past results from the Strategy Tester do not guarantee future results.
• Trusting unrealistic claims. Be careful with any EA that promises easy or risk-free returns.
• Ignoring risk settings. Always check Lot size and Stop Loss.