Why are pre-market and post-market sessions important?

The pre-market session is the time before the market officially starts. It helps find the right price for a stock based on early orders from traders. This session takes place in the morning before the main market hours begin. The post-market session is important as it allows traders to make any changes or corrections in their positions taken during the day or if they want to square off any positions that they were earlier planning to carry-forward, based on the availability of buyer/seller for the trade.