A style is referring to how you address a person in a formal manner. It varies on the status of a person. For example a married woman would be addressed as Mrs (). A prince would be addressed as His Royal Highness. A male (regardless of being married) would be addressed as Mr.
Examples
Mrs Smith. Mr Smith Master Smith (Master is usually used by the oldest son in this case the oldest son of the Smith family). His Royal Highness The Prince of Wales. His Serene Highness The Prince of Monaco. Her Imperial Highness Grand Duchess Olga Nikolaevna of Russia.
Other styles of address
Your Lordship or your Ladyship is how minor members of nobility are addressed. The Right Honourable is traditionally used by Prime Ministers. His Grace The Duke of Devonshire. A style used by English/British Dukes.
Related pages
Highness
Honorific
Diplomacy
Protocol (diplomacy)
Notes
References
Styles (manners of address)