Which coordinating conjunction is used for expressing a reason or explanation?

For example, the sentence "Ich möchte Milch kaufen, denn ich habe keine zu Hause."

The coordinating conjunction 'denn' is used to provide a reason or explanation for the action or state described in the main clause. In this case, the desire to buy milk is explained by the fact that there is no milk at home. Note - 'weil' can also fill this role, but doesn't fit in this sentence grammatically as the verb would need to move to the end.