Difference between ALTHOUGH and THOUGH

The conjunctions ‘although’ and ‘though’ have the same meaning and most of the time can be used interchangeably. ‘Though’ is much more informal than ‘although’, so it is more common in speaking.
They may stand at the beginning of the sentence:

• Although he didn’t introduce himself, I knew he was James Bond.
• Though he didn’t introduce himself, I knew he was James Bond. (informal)

in the middle:

• I knew he was James Bond, although he didn’t introduce himself.
• I knew he was James Bond, though he didn’t introduce himself. (informal)

Tip: you can also use ‘even though’ to sound more formal:

• I knew he was James Bond, even though he didn’t introduce himself.

In informal English, you may use ‘though’ at the end of a sentence:

• James is coming to the party. He hates parties, though.