Stock simulators are software that takes in real market information, with a delay, and enables users to use fake money to test out different investing strategies.
Investopedia:
Investopedia stock simulator is a really simple and free simulator ideal for beginners, as they have comprehensive tutorials on the site and the ability to compete with friends.
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Wall Street Survivor:
Wall Street Survivor is another free stock simulator that is friendly for beginners, as they contain plenty of guides, but also provides more advanced features such as watchlists
Stock trading software are apps that allow users to input real money and purchase stocks and other investment options through them, usually with a small percent commission.
Robinhood:
Robinhood is a free to use stock simulator with a simple but useful UI. Robinhood allows you to buy fractions of stock, allowing you to invest with small amounts of money.
WeBull:
WeBull is a much more comprehensive, technical, and less-beginner friendly trading app compared to others, but it is still free and highly usable.
Sources:
https://www.investopedia.com/
https://www.wallstreetsurvivor.com/
https://robinhood.com/us/en/
https://www.webull.com/