Is data only used up when not connected to Wi-Fi?

My parents are talking about getting me an iphone. Its says on a tariff that i would get 1gb of data. Is data used up when i'm connected to my home Wi-Fi or is it just when i'm using 3g. If it is 1gb should be fine because i don't imagine ill be doing that much searching when i'm on the go. Also is data used for apps that don't connect to the internet

Data is only used when on 3G, no data is used when connected to Wi-Fi.

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