Market transparency means that everyone can see what is happening in a market. Just imagine you are playing a game with your friends, and everyone knows what the others are doing, and what cards they have. This would be a transparent game. In the same way, a transparent market lets everyone see what is happening: how much things cost, what people are buying or selling, and how much is available.
When markets are transparent, everyone can make informed decisions about buying or selling, and everyone has a fair chance to participate. This is important because when people make decisions, they need good information to make the best choices. Also, it's important that everyone has the same information so that nobody can take advantage of others.
For example, if there is a farmer who knows how to produce a special kind of fruit, but nobody knows about it, they may be able to charge a lot of money for it. However, if everyone knows about it, they can see that it's not any different from regular fruit and won't pay extra. With transparency, everyone is on the same level playing field, and nobody can take advantage of others by keeping information hidden.
Overall, market transparency helps to ensure fairness so that everyone can make informed choices and participate equally in the market.