My name is [Celebrant's full name] and I am duly authorised by law to solemnise marriages according to law and to officiate at your marriage today. I take this opportunity to wish you both much happiness in your future lives together.

There is no difference between a wedding celebrant and a wedding officiant. It's two different ways to describe the same thing. Both refer to the person who performs the wedding ceremony. There's no legal implication in the use of either name.

A celebrant is a person who performs ceremonies marking some of life's biggest milestones. As well as officiating weddings, celebrants often perform vow renewals, baby naming ceremonies and funerals. For weddings, a celebrant will create a bespoke, meaningful ceremony that isn't religious.