A salute is usually a formal hand gesture or other action used to display respect in military situations. Salutes are primarily associated with the military and law enforcement, but many civilian organizations, such as Girl Guides, Boy Scouts and the Salvation Army use formal salutes. Ordinary civilians also salute informally to greet or acknowledge the presence of another person, such as a tip of the hat or a hand wave to a friend or neighbor.

Throughout history, military organizations have used many methods to perform salutes. Depending on the situation a salute could be a hand or body gesture, cannon or rifle shots, hoisting of flags, removing headgear, or other means of showing respect or deference.

According to some modern military manuals, the modern Western salute originated in France when knights greeted each other to show friendly intentions by raising their visors to show their faces and show that they are not carrying a weapon (in their right hand).^{[citation needed]} Others also note that the raising of one's visor was a way to identify oneself saying "This is who I am, and I am not afraid." Medieval visors were, to this end, equipped with a protruding spike that allowed the visor to be raised using a saluting motion.

The US Army Quartermaster School provides another explanation of the origin of the hand salute: that it was a long-established military courtesy for subordinates to remove their headgear in the presence of superiors. As late as the American Revolution, a British Army soldier saluted by removing his hat. With the advent of increasingly cumbersome headgear in the 18th and 19th centuries, the act of removing one's hat was gradually converted into the simpler gesture of grasping or touching the visor and issuing a courteous salutation.

As early as 1745, a British order book stated that: "The men are ordered not to pull off their hats when they pass an officer, or to speak to them, but only to clap up their hands to their hats and bow as they pass." Over time, it became conventionalized into something resembling the modern hand salute. In the Austrian Army the practice of making a hand salute replaced that of removing the headdress in 1790, although officers wearing cocked hats continued to remove them when greeting superiors until 1868.

The naval salute is said to have evolved because the palms of sailors were often covered with tar and pitch, so Queen Victoria required that palm be turned downwards. During the Napoleonic Wars, British crews saluted officers by touching a clenched fist to the brow as though grasping a hat-brim between fingers and thumb.^{[citation needed]}

Hand salutes are normally carried out by bringing the right hand to the head in some way, the precise manner varying between countries and sometimes amongst various branches of the armed forces of the same country. The British Army's salute is almost identical to the French salute, with the palm facing outward. The customary salute in the Polish Armed Forces is the two-fingers salute, a variation of the British military salute with only two fingers extended. In the Russian military, the right hand, palm down, is brought to the right temple, almost, but not quite, touching; the head has to be covered. In the Hellenic Army salute, the palm is facing down and the fingers point to the coat of arms.

In many militaries, hand salutes are only given when a cover (headwear, usually a hat) is worn.