Recently, someone asked me what RSI means, so I’ll explain this indicator systematically, because beginners often get it mixed up.

RSI’s full name is Relative Strength Index. Simply put, it’s used to judge whether an asset has been overbought or oversold. The value moves between 0 and 100; exceeding 70 usually implies overbought (it may be about to fall), while falling below 30 implies oversold (it may be about to rise). This indicator was developed in 1978 by an analyst named Welles Wilder, and it still remains one of the most commonly used tools in technical analysis.

Its principle isn’t complicated, really. RSI looks at the magnitude of price increases and decreases over a period of time (usually 14 days), and then calculates it with a formula: RSI = 100 - (100 / (1 + RS)). Here, RS is the average gain divided by the average loss. The final number quantifies how strong the asset is internally.

The scenario where I use RSI the most is to find reversal points. For example, when a coin’s price makes a new high, but the RSI is declining, this is called divergence. It usually suggests that momentum is weakening and that a pullback may come next. Conversely, when the price makes a new low but the RSI is rising, that is a bullish signal. These signals help a lot with my entry and exit decisions.

Nowadays, many trading platforms and trading bots have RSI features built in. Algorithmic trading especially relies on this indicator, because it can automatically execute trades based on RSI thresholds, which is particularly useful in high-frequency trading. In the cryptocurrency market and on some large trading platforms, this kind of automated trading is already very common, and machines respond far faster than humans.

That said, it’s important to note that RSI is only a technical tool and not a cure-all. I generally combine it with other indicators—such as moving averages and MACD—and also add some fundamental analysis, so the prediction accuracy can be higher. Relying on RSI alone makes it easier to be fooled by false moves, especially in range-bound markets.

All in all, RSI is an indicator used to measure price momentum, helping traders and investors better grasp when to buy and sell. Whether it’s stocks, forex, commodities, or cryptocurrencies, this indicator’s usefulness is there for everyone to see. The key is to understand its limitations and use it together with other analytical methods—only then can you truly improve your trading results.