Interest in Islam's Trilogy. See what Islam says about interest and profit?

The question-answer session on 'Life is Yours', including prayers, fasting, hajj, zakat, family and society.
In the presentation of Zainul Abedin Azad, NTV's popular event was addressed by the eminent scholar Dr. Abu Bakr Muhammad Zakaria.
Specially asked about the difference between interest and profit in the 504th episode of the telephone, asking the phone to relieve the name of the visitors who are reluctant to disclose the name. The copy was Jahura Sultana
Q: It is a little better to understand the difference between interest and profit.
Answer: In the Qur'an, God has made the sale of God in Carmine and made interest useless. The transaction that has the involvement of the seller, the profits and losses involved in the transaction are both involved, the benefit of that is achieved, the profit The word 'profit' is a comprehensive word. Any benefit is called profit. If you do any other work against your good work, it is also the profit
But interest is associated with a specific score. That is, you have deposited five lakhs of rupees, and at the end of the month, took five hundred and twenty thousand rupees, that is the interest. Get more money in exchange for money.
The thing that is profitable, which is allowed in the Shari, is one's money. For example: I will do business with you, where you will get some profit based on profit and loss and you will also have to take part in losses.
It must be a contract, have to be written, everyone has to be aware of it, can not be kept in the dark and must be written in such a way that you have to take on the basis of profit and loss.
I give you money if you do business, both will take a specific part of the profits and both of them will have to bear the loss.