Mutual funds are not all alike and have the same risks and returns. There are mutual to put their money into bonds and futures, or other mutually to place them into shares. Depending how it goes their performance and you get (a part thereof). Also focus on different commissions. There are entry and exit (you pay to enter and exit), custodial and management fees (to the states and to sell / buy this for you). In just Greek, and even negative returns, mutual'll keep a percentage (from 0.5 to 3% per year) rain / snow. The money is available at any time (usually 2-3 days notice), the that money is the one corresponding to the current value (as shares). There is no guarantee of capital or a guarantee of performance.