A trust is a promise - that you will not change. It is also a promise that you will always be there.
The Chinese word for trust is shown below. It consists of two radicals. On the left is "people", and on the right is "words". Trust means "you mean what you say", and nothing else. No conditions, no exceptions, no special explanations.
If you can STAND BEHIND WHAT YOU SAY, then you are trust worthy.
A company with trust have better relations, and better profit margin. People pay their friends more generously.
How to earn or make it?