Market protection is a way to protect traders/investors from adverse price movements in the market. For example, if you place a buy market order when the last traded price (i.e. market price) is ₹100 but sellers are available only at ₹600 (for other reasons i.e. low liquidity, high volatility), your order will get executed at ₹600. This, for you, will cause a loss of ₹500.