わざわざ
going out of one's way, specially
わざわざ + action
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わざわざ means doing something that takes extra effort, when it wasn't strictly necessary: わざわざ駅まで迎えに来てくれた, "they went out of their way to meet me at the station".
It's common in thanks: 遠いところを、わざわざありがとうございます, "thank you for coming all this way". It acknowledges the trouble someone went to.
It can also question whether the effort is worth it: わざわざ行かなくても、電話で済む, "there's no need to go specially; a phone call will do".
Don't confuse it with わざと, "on purpose", which is often mischievous. Compare せっかく, which is about not wanting to waste an effort already made.
Examples
遠いところを、わざわざありがとうございます。
Thank you for coming all this way.
わざわざ駅まで迎えに来てくれた。
They went out of their way to meet me at the station.
わざわざ行かなくても、電話で済む。
There's no need to go specially; a phone call will do.
わざわざ買ったのに、使わなかった。
I went out and bought it specially, and then didn't use it.
わざわざ私のために作ってくれたの?
You made this specially for me?