Defensive strategies are used by market leaders to hold onto their position against competitors trying to take market share. The goal is to maintain existing market share and maximize profits by reinforcing competitive advantages and making it difficult for others to enter the market. There are various defensive strategies including position defense to hold the current position, mobile defense through constant changes, and flanking defense through diversification into new markets. When pursuing a defensive strategy, there is little room for error as competitors can do significant damage even by capturing a small part of the business.