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Permanent Account Number
Increasingly, the Permanent Account Number (PAN) is your single important number that defines you as Indian. Originally, the PAN was meant to be a unique identification number for all Indian individuals and companies of all hues for the purpose of Income Tax. Increasingly, it has become a ubiquitous requirement - to buy stocks, mutual funds, real estate, insurance, to do anything significant in your bank account, etc.
Even if you fall below the tax bracket or are not liable to pay tax, you would still do well to get a PAN. In fact, it is worthwhile getting a PAN even for your newborn kid - she will need it very soon anyway. The process of getting a PAN has become smooth and efficient; you can apply for it here: https://tin.tin.nsdl.com/pan/form49A.html
If you haven't done so already, intimating your PAN to your Banks immediately is a good idea.