In Military organisations the word ‘Colour’ is used to describe both the regimental flags of infantry battalions and the flags of the Household Cavalry.

'Colours' are large brocade and embroidery flags which were originally carried into battle so that soldiers of a particular unit could see where the rest of their unit was located at all times and used as a rallying point during the course of the battle. Although the Colours are no longer carried in battle, they constitute the symbol of the Regiments' honour and represent its devotion to duty. As such they are held in the greatest esteem by the soldiers and officers. They are brought out on important parades and regimental occasions and are escorted by a ‘Colour Party’.

The infantry units of the British army each have two Colours: the Queen's Colour, which is a union flag and symbolises the regiment's loyalty to the Crown, and a regimental Colour which has all the unit's battle honours inscribed on it. Thus a 'stand' or pair of Colours for a regiment normally comprises:

A Queen's Colour: usually with the design of the Union Flag with a gold circle in the centre, within which the regiment's name (and sometimes initials or number) are inscribed.

A Regimental Colour: usually a plain flag in the colour of the regiment's 'facings' (traditionally the colour of the lining of the redcoat jacket) or the Cross of St George, with the regiment's insignia in the centre.

New Colours are occasionally presented to a Regiment by The Queen or another member of the Royal Family, often to mark a special anniversary or event in the Regiment's history. The special ceremony at which the new Colours are presented usually involves a parade and an inspection by the member of the Royal Family who is present. The Queen will often give a short speech. In 2012, when Her Majesty presented new colours to the Coldstream Guards, The Queen said:

'Thirteen years have passed since I presented you with the Colours which have just been marched off. Since then, there have been many changes in your ranks, but the spirit of the Regiment has remained intact through all the challenges and dangers which you have been required to face.'

Following the presentation of new Colours, the flags being replaced are not destroyed but are laid up in a regimental museum, church, or other military building with significance to its particular unit.