Day trading is a commonly-used technique, albeit an inherently risky one, in the world of finance. It requires swift decisions, prompt actions, and a keen eye for market trends. However, when executed rightly, it can offer lucrative rewards.

Day trading entails the process of purchasing and selling financial assets - like stocks, currencies, or commodities - all within the confines of one trading day. This means positions are usually opened and closed within a single session. This method is typically used by seasoned traders due to its inherent risk.

Day trading's core principle rests on exploiting market volatility. Through capturing the price trade the day movements in a day, traders can capitalize on small gains that collectively result in significant profits.

To succeed in day trading, individuals need a robust strategy. This plan ideally encompasses technical analysis, efficient risk management, and the mental fortitude to handle the stress. Technical analysis involves the use of charts and other tools to identify patterns that can predict future price movements. Risk management implements safety measures against potential financial detriments.

The human mind and emotions significantly influence day trading. Impulse and fear-induced decisions are common pitfalls that can lead to substantial losses. Hence, staying disciplined and adhering to the trading strategy is the cornerstone of success in day trading.

It remains paramount to understand that day trading is not for everyone. The inherent risks, coupled with the need for specialized knowledge, can daunt newcomers. Without proper knowledge and understanding of financial markets, technical analysis, and risk management, diving into day trading might be a dangerous endeavor.

While day trading can be profitable, it also comes with potentially severe losses. Sound knowledge, proper planning, and discipline are the pillars of successful day trading. Hence, approaching day trading with the level of seriousness and respect it demands is vital.

Despite the risks, day trading can be a rewarding endeavor for those who do their due diligence and are willing to put in the work.

In conclusion, day trading is a risky but potentially lucrative financial activity. It involves not just understanding market trends, but also being psychologically prepared to handle the pressures of swift trading. In the end, day trading isn't a get-rich-quick scheme, but rather a financial venture that requires patience, discipline, and the tenacity to weather the waves of the fickle financial market.