A conjunction used to add information, reasons, or emphasis to what was just said (equivalent to 'besides', 'moreover', 'in addition').
彼は優秀だ。それに、努力家でもある。
He's excellent. Besides, he's also a hard worker.
今日は忙しい。それに、体調もよくない。
I'm busy today. On top of that, I'm not feeling well.
安い。それに品質も悪くないから買った。
It was cheap, and the quality isn't bad either, so I bought it.