ところが
but, however (unexpectedly)
Sentence。ところが、unexpected result。
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ところが introduces a result that goes against what was expected: 朝はいい天気だった。ところが、午後から雨が降り出した, "the morning was lovely. But in the afternoon it started raining".
It's a "but" with surprise. The second half is usually a fact that already happened, often something outside the speaker's control. That's why it can't lead to your own intention, request or command.
Compare しかし and でも, which are general "but"s, and それなのに, which adds frustration ("and yet"). ところが is closer to "as it turned out".
Don't confuse it with ところで, "by the way", which changes the subject.
Examples
朝はいい天気だった。ところが、午後から雨が降り出した。
The morning was lovely. But in the afternoon it started to rain.
すぐ終わると思っていた。ところが、三時間もかかった。
I thought it would be over quickly. As it turned out, it took three hours.
急いで駅に行った。ところが、電車はもう出た後だった。
I hurried to the station. But the train had already gone.
彼は簡単だと言った。ところが、実際はとても難しかった。
He said it was easy. But in fact it was really hard.
店に電話した。ところが、誰も出なかった。
I rang the shop. But nobody answered.