ところで
Change the subject with “by the way”
You’ll be able to move naturally to a different topic after finishing or interrupting the current one.

明日は晴れますね。ところで、どこへ行きますか。
ashita wa haremasu ne. tokorode, doko e ikimasu ka.
What do you think this sentence means?
It will be sunny tomorrow. By the way, where are we going?
Change the conversation topic
ところで is a discourse connector meaning "by the way" or "incidentally". It smoothly transitions the conversation to a fresh, unrelated topic or question.
久しぶりですね。ところで、今どこに住んでいますか。
hisashiburi desu ne. tokorode, ima doko ni sunde imasu ka.
It’s been a long time. By the way, where are you living now?
今日は暑いね。ところで、宿題は終わった?
kyou wa atsui ne. tokorode, shukudai wa owatta?
It’s hot today. By the way, did you finish your homework?
Place ところで at the start of the new topic
Start a new sentence with ところで, followed by a comma, to pivot smoothly to a new question or subject.
旅行の話はまた今度聞かせてね。ところで、お昼ご飯はもう食べた?
ryokou no hanashi wa mata kondo kikasete ne. tokorode, ohirugohan wa mou tabeta?
Tell me more about your trip next time. By the way, have you already eaten lunch?
ところが vs ところで
They differ by one kana. ところが continues the same story with a result nobody expected. ところで drops the story and starts a new topic.
ところが, however (surprise)
駅まで走った。ところが、電車はもう出ていた。
eki made hashitta. tokoroga, densha wa mou dete ita.
I ran to the station. However, the train had already left.
Same story, unexpected result.
ところで, by the way
駅まで走った。ところで、昼ご飯は食べた?
eki made hashitta. tokorode, hirugohan wa tabeta?
I ran to the station. By the way, have you eaten lunch?
Starts a new topic.
「会議の資料、ありがとうございました。ところで、先週の出張はいかがでしたか。」
“kaigi no shiryou, arigatou gozaimashita. tokoro de, senshuu no shucchou wa ikaga deshita ka.”
“Thank you for the meeting documents. By the way, how was your business trip last week?”
「この写真、よく撮れてるね。ところで、来月の同窓会には行く?」
“kono shashin, yoku toreteru ne. tokoro de, raigetsu no dousoukai ni wa iku?”
“This photo came out really well. By the way, are you going to the class reunion next month?”
「風邪はもう治った?そう、よかった。ところで、借りていたDVD、いつ返したらいい?」
“kaze wa mou naotta? sou, yokatta. tokoro de, karite ita dii-bui-dii, itsu kaeshitara ii?”
“Is your cold better? Oh, good. By the way, when should I return the DVD I borrowed?”
7 more examples in the grammar path — free for a limited time.