Big class traders in forex trading are typically institutional investors with deep pockets, access to extensive market data, and advanced trading technologies. They can move the market with their trades and have a long-term investment strategy. Small traders, on the other hand, trade with much smaller capital, rely on technical analysis and have a shorter-term trading approach. They can be more susceptible to market volatility and have a higher risk of losing money, but can also make gains quickly if they have the right strategy.