What is Investing? 

Investing is putting your money aside for long term gain, and over a long period of time. Think (5-10 years) 

What is Day trading? 

Day trading is putting your money into stocks for short term profits. Think (Few hours-few days at most) 

What are stocks? 

Stocks are shares/ownership of a company publicly being sold so that the company can use that money in order to grow there business.