Support

Support is a price level where buying pressure is strong enough to prevent the price from falling further. In other words, it is a level where the demand for the asset is greater than the supply. When the price of an asset approaches a support level, traders often expect it to bounce back up, as buyers enter the market to take advantage of the lower price.For example, imagine that a stock has been trading in a range between $50 and $60 for several weeks. If the price of the stock falls to $55 and then bounces back up, $55 can be considered a support level. Traders may use this level as a buying opportunity, assuming that the price will continue to rise from this point.

Resistance

Resistance is the opposite of support. It is a price level where selling pressure is strong enough to prevent the price from rising further. In other words, it is a level where the supply of the asset is greater than the demand. When the price of an asset approaches a resistance level, traders often expect it to fall back down, as sellers enter the market to take advantage of the higher price.

For example, imagine that the same stock mentioned above is now trading in a range between $60 and $70. If the price of the stock rises to $65 and then falls back down, $65 can be considered a resistance level. Traders may use this level as a selling opportunity, assuming that the price will continue to fall from this point.