Re-tensioning spokes?

Morning all
. I keep reading bout people re-tensioning thier spokes and as i understand it this is basically truing it? Right? If not then what's it about, just keeping the wheel it's strongest? And how often should i do this? That's if i can? Sorry if it sounds like a dumb question, i just wanna try and learn as many things as i can bout servicing and what not. What with my LBS chargin 100 quid for a full service :shock: i'm keen to learn as much as i can.
Cheers and thanks for readin
Scott.

Cheers and thanks for readin
Scott.
"If i was a slug i don't think i could handle it, i'd just throw myself in the salt pot" -Karl pilkington
Whyte 46, i fall off it alot!!
Whyte 46, i fall off it alot!!
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Posts
retensioning is not always retruing.
Parktools :?:SheldonBrown
A well built wheel does not need retensioning, but people seem to think it's a standard maintenance routine. However...
With poorly built wheels some rectification work is usually necessary and there are a lot of people fettling poor wheels and talking about it creating the myth that retensioning is a required operation on all wheels.
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Roger