A groomsman (North America), best man (United States) or usher (British Isles) is one of the male attendants to the groom in a wedding ceremony. Usually, the groom selects close friends and relatives to serve as groomsmen, and it is considered an honor to be selected. From his groomsmen, the groom usually chooses one to serve as best man.
For a wedding with many guests, the groom may also ask other male friends and relatives to act as ushers without otherwise participating in the wedding ceremony; their sole task is ushering guests to their seats before the ceremony. Ushers may also be hired for very large weddings.
In a military officer's wedding, the roles of groomsmen are replaced by swordsmen of the sword honor guard. They are usually picked as close personal friends of the groom who have served with him. Their role includes forming the traditional saber arch for the married couple and guests to walk through.
The most visible duty of the groomsmen is helping guests find their places before the ceremony and to stand near the groom during the wedding ceremony.
Additionally, the groom may request other kinds of assistance, such as planning celebratory events such as a bachelor party, also called a stag-do or buck's night; helping make the wedding pleasant for guests by talking with people who are alone or dancing with unaccompanied guests or bridesmaids, if there is dancing at a wedding reception; or providing practical assistance with gifts, luggage, or unexpected complications. Groomsmen may also participate in local or regional traditions, such as decorating the newlywed couple's car. The other and also very important task of the best man is to give a speech during the wedding. This is usually decided between the bride and groom before the wedding. The best man speech is usually humorous and short.
Bridegroom-men formerly had important duties. The men were called bride-knights, and represented a survival of the primitive days of marriage by capture, when a man called his friends in to assist to "lift" or kidnap the bride, or from the need to defend the bride from would-be kidnappers.
The best man is the chief assistant to the groom at a wedding and (along with the maid of honour) is the third most important in attendance after the bride and groom. While the role is older, the earliest surviving written use of the term best man comes from 1782, observing that "best man and best maid" in the Scottish dialect are equivalent to "bride-man and bride-maid" in England.