Day trading is a challenging and risky financial activity. It requires swift decisions, prompt actions, and a keen eye for market trends. However, in capable hands, it may pave the way to immense profits.

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 implies that trades are typically initiated and concluded in a single trading period. It's a strategy usually employed by experienced traders given its high-risk nature.

Day trading's core principle rests on exploiting market volatility. By leveraging these intra-day price fluctuations, traders aim for small, consistent profits which, when accumulated, could lead to a hefty sum.

To succeed in day trading, individuals need a robust strategy. This strategy should incorporate technical analysis, risk management, and psychologically discipline. Technical analysis, a key component of the strategy, employs graphs and other analytical tools to discern patterns which could foresee future price trends. Risk management, on the other hand, involves setting up safeguards against potential losses.

Psychology plays a significant role in day trading. Impulse and fear-induced decisions are common pitfalls that can lead to substantial losses. Therefore, maintaining discipline and sticking to the trading plan is crucial for success.

It's crucial to realize that day trading may not suit everyone's financial goals or risk tolerance. The inherent risks, trade the day 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. Successful traders attribute their triumphs in day trading to solid knowledge, diligent planning, and formidable discipline. 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. Successful day trading demands a comprehensive understanding of market trends and the mental capacity to withstand the stress of quick-fire trading decisions. 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.