What do you understand by the Ansoffs matrix, define the seperate strategies that can be used

Four strategies that businesses in relation to marketing a business will use each are used at a particular moment

Market penetration- Introduction to the market encourage sales development
Market development- Attempts to further increasements in market share
New-product development- Offers more variety, meets customers needs more products with less risk
Diverstation- Entering a new market, business establishes themselves