What does endogenity of trade mean?

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Or in general what characterises an exgo- or endogeneous variable?

I have tried to read the explanation on wikipedia, but to no avail.

In: 1

An exogenous variable in a model is one you cannot predict (and usually explain) in detail, it comes from outside the model. An example would be technological progress in the [Solow-Swan model](https://en.wikipedia.org/wiki/Solow%E2%80%93Swan_model?wprov=sfti1)

Endogenous is the opposite, you know how to get it, what causes it and you can explain it. That means models have some degree of control over endogenous variables.