Can anybody tell me what this outside pipe does?

[OutsideTap]

Hi all,
I was wondering if anyone could tell me what this pipe does. I had to change a washer in an inside tap, and I turned this outside tap off thinking it may be the main waterline. It wasn't. However, since I've turned it back on it is leaking from the tap. Any ideas as to what this pipe is there for?
Thanks in advance

 

[SimonG]

Gland nut just needs a tighten.

Underneath the handle is a hex nut. Tighten that up a touch to stop the leak.

 

[snowhead]

It may be the main waterline shut off, but the washer has failed or you didn't turn it off enough.

Is there a remote garage or external utility room or is there an irrigation system in the garden?

 

[OutsideTap]

Gland nut just needs a tighten.

Underneath the handle is a hex nut. Tighten that up a touch to stop the leak.

Cheers mate I'll give that a try

It may be the main waterline shut off, but the washer has failed or you didn't turn it off enough.

Is there a remote garage or external utility room or is there an irrigation system in the garden?

I suppose it could be the main waterline shut off, but there is a line with a meter attached that is actually the main waterline shut off. I know this because it when I turned it off the water to my and my neighbours apartment both shut off. I was thinking that perhaps it was the shut off to my individual flat.
It's possible that I didn't shut it off enough. No there's definitely no remote garages or utility rooms, and there's no irrigation system in the garden.
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Thanks for your help lads, I tightened the hex nut and the leak has stopped. Thanks for your time