Trading indicators are very useful for traders; they help answer the following common questions:

What to do if a currency pair (or any financial asset) is reaching historical highs or lows, so there is not enough support or resistance, or any support or resistance to guide you in making entry and exit decisions?

How do you know you are not buying at a high price or short selling at a low price, just before the trend ends? Ideally, in both cases, you should wait for some kind of pullback, but at the same time, you may risk missing the trend!