A mutual fund is a pool of money from numerous investors who wish to save or make money just like you. Investing in a mutual fund can be a lot easier than buying and selling individual stocks and bonds on your own.
When investing into Mutual funds, you have two options.
1. Lump sum, when you put a bulk amount at a time. So if you had Rs 1lk with you and invested into a particular mutual fund, it is called lump sum investment.
2. SIP (systematic investment planning), when instead of putting a bulk amount at a time, you keep investing small amounts at a regular interval.
Check this article.