RakuMargin is an account that allow you to trade (buy/sell on Bursa Malaysia) using available funds and/or with a pre-approved facility limit powered by Kenanga Investment Bank Berhad. It operates like a credit card.
A Nominees account is like sunscreen as it doesn't block out sunrays completely the way sublock does. Instead it gives added benefits of transforming rays into heat to give a cool island tan. Read more on your Nominee perks.
A contra account gives you higher trading limit so that you can buy more (shares) than what you have in your account (collateral). The higher the limit, the more shares you can buy. It's kind of like shopping with a charge card except in this case you BUY / SELL shares.