What Happens When You Invest?

[thiccboygamerTTV]

Hello, first of all, I apologize for my ignorance, but I am very curious about something. I tried to research but couldn't quite understand. For instance, when an investment is made in an e-commerce site, I know that its value increases. Are specific company shares being purchased with these investments, or is the investment made with the intention of multiplying the money and then disconnecting later? I hope I have been able to explain myself clearly.