Technical Indicators are the often squiggly lines found above, below and on-top-of the price information on a technical chart. Indicators that use the same scale as prices are typically plotted on top of the price bars and are therefore referred to as “Overlays”.
If you are new to stock charting and the use of technical indicators, the following article will help you get going:
We also have a large collection of Market Indicators documented on this page.