If you are looking for high returns and have some surplus money to put aside for a few years, mid cap mutual funds are best for you. Equity mutual funds invests the collected amount in companies listed in stock market. Size of these companies depend on their market capital. It is defined by the number of shares issued by them multiplied by value of each share.
Mid cap mutual funds invest in companies with market capital ranging from Rs. 500 Cr to Rs. 20000 Cr.
Medium sized companies can give potential capital downfall in the short term but have higher chances of giving high returns in the long term.