A Client ID for a demat account is a unique identification number assigned to an individual or entity by a depository participant (DP). It helps in keeping track of the securities held in the demat account and facilitates smooth and efficient transfer of securities. It is necessary for various transactions related to the demat account, such as buying and selling of securities, pledging, and dematerialization of physical certificates.

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Call and put options are two of the most common types of options contracts. A call option gives the holder the right, but not the obligation, to buy a specified asset at a specified price on or before a specified date. A put option gives the holder the right, but not the obligation, to sell a specified asset at a specified price on or before a specified date. Importantly, these rights do not require buying or selling the underlying asset at a pre-decided price within a specific timeframe. Read on to learn more about them.