Why don't we stay away from something we don't have an iota of knowledge about?
In order to understand the basics of Islamic banking, you should have an idea of conventional banking and the implications on the economic system. Moreover, what is interest and the conditions applied on it such as time and direct profit on money. The profits of conventional banks are dependent on the profit rates provided by State bank which is the banking hub. Its a straight margin which as of last time I checked was 12%. It means no matter what, all the banks will get 12% per anum on the amount deposited in the hub. This amount is then divided among the account holders with respect to the types of account such as PLS, Investment certificates, Fix deposits etc and the rest is the margin which banks keep for themselves.
Other than that, Bank lend the money on a staggering 16% to 18% profit rates which is directly related to the time of submission. the late one gets, the more he has to pay. On the other hand, Islamic banking doesn't encourage interest. They do not claim the interest from State bank but are highly dependent on the credit system whereby they do not lend money directly rather they buy goods and sell it on a fix profit for which loan has been applied for.
It would be pertinent to note that there are several prominent scholars such as Mulana Taqi Usmani making efforts to market this system and make it work since this system discourage concentration of wealth. There are still flaws which these scholars are trying to fix. If you are interested, you can read Islamic Banking which is written by him. There are too many myths attached to this system and investors mainly rely on Current account that it is interest free but you will be surprised to know it is the most profitable venture for any bank. They get straight 12% profit and do not have to pay a single penny to the account holder.