There are many new people learning about cryptocurrency that Tether is a coin similar to BTC, ETH, XRP and can be invested to make a profit, but not so, it is just a coin for you to keep the price. value of other coins. As for BTC, ETH, .. and other altcoins their value is always very volatile. You can take advantage of that to invest in a profit by buying when the price is low, by selling at a high price.