The Royal Family is a long-running institution and one that has many values and rules that go back many years.
Of course, you should be bowing to the current monarch if you are a man and performing a small curtsy if you are a woman. While other people prefer to shake hands in the usual way you'd greet any other person.
There are actually no obligatory codes of behaviour when meeting the King, Queen or any other member of the royal family, but there is such thing as the royal protocol that goes back decades.
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To greet the sovereign, the formal address is 'Your Majesty', while other members of the royal family are greeted by 'Your Royal Highness', followed by either 'Sir' or 'Ma'am'.
Even members of the royal family are expected to follow the protocol, with that to done to King Charles and Queen Camilla.
Majesty managing editor Joe Little told Page Six: "It would be the protocol to bow to the new king and queen.
"Any time the royal family meets the new king and queen, the done thing would be to bow or curtsy to them."
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Well, it appears that Prince William forgot that protocol at the Coronation concert last night (7 May).
The event that took place on the grounds of Windsor Castle was action packed, with the likes of Katy Perry, Lionel Richie and Olly Murs performing to millions at home and 20,000 fans in Windsor.
So it would be understandable that the protocol could be forgotten in all the excitement, but fans have been left divided.
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Video footage has been circulating of the King and Queen entering the venue last night for the concert, with them walking past the likes of William and Princess Kate.
As Charles walked past William, Kate, George and Charlotte, the four of them performed the royal protocol, but the same could not be said for Camilla.
In fact, it was only Kate that performed a curtsy to the Queen, while George, Charlotte and William stood there normally.
It should be noted that if you have already met the royal earlier on in the day, you do not need to perform the royal protocol - but it is unclear if that is the case in this situation.
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The encounter has divided opinion online, with many flocking to the comment section of a video posted by @tasha_mc1to give their opinion.
"Think it’s only if you meet for first time that day. Which means he’s seen her earlier in day," one person wrote.
A second added: "William isn't so innocent, apple doesn't fall far from the tree with that one."
Meanwhile, a third simply remarked: "Smooth William."
Featured Image Credit: BBCTopics: Prince William, Royal Family, King Charles III