You use though to introduce a statement in a subordinate clause which contrasts with the statement in the main clause. You often use though to introduce a fact which you regard as less important than the fact in the main clause.
although
Everything I told them was correct, though I forgot a few things.
我告诉他们的全部正确,尽管我忘了几件事。
I like him. Though he makes me angry sometimes.
我喜欢他,尽管他有时惹我生气。
You use though to introduce a subordinate clause which gives some information that is relevant to the main clause and weakens the force of what it is saying.
He did reply, though not immediately.
他确实回复了,不过不是立马回复。