Trading 101: What Makes A Stock Price Change?

For those of you who are brand new to the stock market and just getting started as a beginner in trading and investing, this is a common question I get. Sure, you may understand what the stock market is from a general context, but getting more details you may be wondering, what 'actually' makes a stock's price move? Yes, a stock will move up and down in value as time passes, but what is causing this to happen. Who determines the value of a price and why does it move? As a beginner trader and investor, these are the concepts you will need to fully understand if you want to make money and be successful in the stock market. Let's take a very simplistic approach to this question so you can have a full understanding of just how the stock market works in regards to the stocks themselves moving up and down in value.