Making a trade for the short time frame and close before opposite movement of the market is called scalping strategy. Most of experienced traders make a trade for the short time periods hold that trades till market moves into his favour when market goes to her favour peak pont a scalping trader closed that trade and takes some profit from that trade. Again when market moving that's last closed trades who is closed in profit and now market starts moving from that's trade against a scalping trader makes again trade against his last closed trade. That trader gets small amount of profits from many trades. He makes many trades in a short time and closed them quickly and gets some profit so this is a good strategy for the beginners.