Indices refer to the statistical measures of change in an economy. It is also called, securities market where an index is an imaginary portfolio of securities that represent a portion of the market.
Prior to investing, it is always wise to get an advisor. An advisor is someone who is knowledgeable in the different trends of a particular market. All wise business owners have their own consultants and advisors to portion their assets in a way that it will lead to good investments in the future.