Spot trading is your normal buying/selling. You spend one currency to get another.
Margin trading is not your normal buying/selling. Essentially, a margin trade in one product is a bet on the price of that product, using borrowed money to attempt to amplify your profits.
This Help Center section does not aim to educate customers on what is margin trading. We are here to troubleshoot any issue you may have during your trading session. We assume that before placing a margin order, you are well informed of how margin trading works and all the risks it carries.
For those who want to learn more, Investopedia has an extensive guide on general margin trading here: Margin Trading.