Autotrading is the type of trading that happens with 0 intervention from you. You will use a software called Expert Advisor (EA), also known as a trading robot and use it on a MT4 trading platform in order to have do autotrading.
Copy trading is another service. With copy trading there is a master account where a portfolio of robots or a trader opens and closes traders and all these trades are copied to connected accounts.
As a recommendation, diversification is a very important thing in trading. Diversification can be done like this:
1. you manual trade with a part of your capital based your trading strategies
2. you can use copy trading based on the signals from other traders
3. you can use a part of your capital for algorithmic trading (with robots)
This type of diversification, where you use different trading styles, markets, strategies in one portfolio, will make your trading more stable.