Tax Deducted at Source (TDS) is a means of collecting income tax in India, under the Indian Income Tax Act of 1961. Any payment covered under these provisions shall be paid after deducting prescribed percentage. It is managed by the Central Board for Direct Taxes (CBDT) and is part of the Department of Revenue managed by Indian Revenue Service . It has a great importance while conducting tax audits. Assessee is also required to file quarterly return to CBDT. Returns states the TDS deducted & paid to government during the Quarter to which it relates.
After employment, I think that most individuals gain income diversification through investing.  It is important to look at why we invest: because at some point we plan on using this money for something.  For most, it is saving for retirement, and the investing is done through vehicles, such as a 401(k) or IRA.  But investing is not just about stashing money away for a rainy day – that is what an emergency fund is for.  Investing is about having enough capital to generate income.
An obvious example is over exposure to bank stocks, which have been excellent investments for over a century.  Though a foundation of most portfolios, bank stocks do involve more risk at certain stages of the economic cycle than many realise.  Being less exposed to bank shares in the last few months could have preserved some capital.  So, a more diversified approach can help mitigate some of these risks.