Instead of putting all the eggs in one basket, put it in multiple baskets. A famous quote which says to lessen the risk with diversification strategy. Same applies to investments as well. Rather than investing all the amount into one option, spread into various options available. The main reason for diversifying is all the investments options like equity, bonds, real estate doesn't have similar characteristics. Through this risk can be controlled to a better extent than without spreading.
Let's consider an example,
Case 1: If I purchase equity shares of Infosys today and due to uncertainty and market fluctuations, the
price sharply declines in one year. So the whole amount imvested will turn out to show loss.
Case 2: If I purchase Infosys with 20% of amount, HDFC stock with 20%, Tata Motors with 20%, Dr Reddy's lab with 20% and Nestle with the rest 20%(in any of combination) Since all of them belong to different industries (IT, Banking, Automobile, Pharma and FMCG) there is high possibility that due to their different characteristics they won't have same movement. They would be negatively correlated which would protect the investment. Even if one industry experiences decline the other industry benefits from surge and appreciation. During COVID when market was experiencing bearish movement, Pharma and healthcare industries have surged. So this is one of the strategy to diversify different equity stocks based on their specific industries.
Case 3: Investing the amount through different options available like equity, bonds, fixed deposits and so on. In this type regular income can also be generated, if the person purchase a bond/FD he would get interest regularly without waiting for capital appreciations. It is also combination of less risky investment (Debenture & FD) and high risky investment which is equity.
Of these 3 Case 1 is very risky and Case 3 is slightly less risky. Equity is subject to market risk (which is uncontrollable) also known as systematic risk. The specific industry risk is known as unsystematic risk which is what mentioned in Case 2
Impacts:
1) Risk Management:
Though the risk can't be completely eliminated, it is reduced to a wider range.
2) High Return:
On an overall basis return generated will be certainly higher.
3) Stable portfolio: When combined together the portfolio would be on a safer side.