A Stock Screener is a tool that allows investors to filter and search for stocks based on specific criteria. It can help investors identify stocks that meet their investment goals and risk tolerance.Stock screeners work by allowing users to input certain parameters, such as the stock's price, market capitalization, dividend yield, and other financial metrics. The screener then searches through a database of stocks and returns a list of stocks that meet the criteria.Example: -An investor is looking for high-growth technology stocks with a market capitalization greater than $1 billion and a P/E ratio less than 20. They could use a stock screener to filter for these criteria and find a list of technology stocks that meet these requirements.Some popular stock screeners include Finviz, Yahoo Finance, and Google Finance. Some of these are free while others are paid. These are web based and can be used by anyone.It is important to note that stock screeners only provide a list of stocks that meet certain criteria and should not be used as the sole basis for investment decisions. It is important to conduct further research and analysis before investing in any stock