The Lot Size represents the standardized number of a financial instrument as set out by the exchange.
When trading stocks, the lot size refers to the number of shares you buy in one transaction.
When trading Options/Futures, the Lot Size (contract size) refers to the total number of contracts contained in one derivative security. The Lot Size is determined by the stock exchange.
Risk Warning: All trading carries risk. Products traded on margin carry a high risk of rapid loss and losses can exceed deposits on some products. Ensure you understand the risks.