A savvy investor who actively engages in the buying and selling of assets based on short-term fluctuations in market prices, is known as a day trader. This strategy involves making quick decisions and taking advantage of market movements to generate profits. Day traders often utilize technical analysis and leverage to increase their gains, but also face high risks due to the fast-paced nature of their trades. It requires a deep understanding of market trends and an ability to navigate volatile conditions. It's a challenging yet exciting approach to investing that requires discipline and skill.