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go - What is the difference between parameter and receiver

I am following a Go tutorial and am stuck as I cant understand a particular method signature:

func (p *Page) save() error {
    filename := p.Title + ".txt"
    return ioutil.WriteFile(filename, p.Body, 0600)
}

The docs explain this as follows:

This method's signature reads: "This is a method named save that takes as its receiver p, a pointer to Page . It takes no parameters, and returns a value of type error."

I cant understand what the receiver is. I would read this as it being a parameter but then I would expect a parameter to be in save().

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