The casino gives you a percentage of your deposit in bonus credits. If you deposit R1,000 and claim a 100% match bonus, you will receive R1,000 worth of bonus credits.
These bonus credits are added to your bonus balance which you will access your bonus funds once you have exhausted the funds in your cash balance.
When you play for real money, match bonuses are a great way to boost your bankroll so that you can play more. Casinos hand out match bonuses as welcome offers or as occasional promotions, in which they are often referred to as Reload bonuses.