The Dow Jones Industrial Average is an index of 30 large blue-chip stock companies on the NY Stock Exchange. It is an indicator of how well the market is performing.

sourece: https://www.investopedia.com/terms/d/djia.asp

The five-day trend shows the average daily stock price and whether it increased or decreased for the day, daily for the past 5 business days, or days when the market was open.

The graphs that you typically see have average stock price information for a company over a longer period of time. There is normally some type of interactive slide bar so you can scroll left and right to see prices on any given day.

an initial public offering, or IPO, is the original group of stocks put out for sale to the public by a company. This is how privately funded companies, when they choose to publicly fund their organization, make that happen. Once there is an IPO the stock gets traded, or bought and sold, on a daily basis.

These are indexes that tell you how the market as a whole is doing. The S&P500 is a good market-level indicator.

The Nasdaq Composite Index is based upon over 2,500 stocks on the Nasdaq Exchange, almost half of which are technology, but also includes healh care, financial, and other consumer service companies. It is an indicator of how well the market is performing.

source: https://www.investopedia.com/terms/n/nasdaqcompositeindex.asp

The Standard & Poor's 500 Index (S&P500) is an index of the largets publicly traded US companies. It is widely used as a guage of how the market is performing.

source: www.investopedia.com/terms/s/sp500.asp

The stock price is the dollar value the stock purchaser spends to buy shares of stock. The price is per share. For example, if the current price is $300 per share and you buy 100 shares, you would pay $30,000 (plus broker fees) to own that stock. Money is made in two ways. Either a stockholder holds the stock long-term and receives dividends from the company's profits, or the stockholder waits for the stock price to increase and sells the stock to someone else. That is what trading is all about.