In stock market trading, support and resistance refer to certain price levels where an asset's price may encounter difficulty moving past. These levels can act as barriers that prevent the price from moving higher (in the case of resistance) or lower (in the case of support).
Support is a price level at which an asset's price tends to find buying interest and may stop its decline. This is because as the price drops towards the support level, buyers may become more inclined to purchase the asset in the belief that it is undervalued at that price. As a result, the supply of the asset may decrease and the demand may increase, causing the price to stabilize or even rise.

On the other hand, resistance is a price level at which an asset's price tends to encounter selling pressure and may stop its advance. This is because as the price rises towards the resistance level, sellers may become more inclined to sell the asset in the belief that it is overvalued at that price. As a result, the supply of the asset may increase and the demand may decrease, causing the price to stabilize or even fall.

Support and resistance levels can be identified using technical analysis tools such as trend lines, moving averages, and pivot points. These levels can be used by traders to make informed decisions about the direction of an asset's price, but it is important to note that they are not always accurate and that the market may break through these levels. Both are key indicators for many traders to make a trade decision. In typical scenarios, whenever, price breaks upside(Resistance) there is a Bullish move and similarly whenever, price breaks support, there is a Bearish move in the market. A trader place order based on the break-out. However, there is a risk of fake break out where trader loose money when market does reverse back on breakout.