An (After-Market ) is an order placed outside regular market hours and when the market opens the next day. If a market order is submitted when the market is closed, it will be placed as a limit order with a 5% limit. This is to protect you from large price fluctuations during market hours.
For example, if an AMO order is placed at ₹100, it will be converted to a limit order with a 5% price protection range. The will be purchased if the stock opens the next day below ₹105. However, if the price exceeds ₹105, the order will be placed as a limit order at ₹105.