Pro12 is a professional rugby union league that features teams from Ireland, Italy, Scotland, and Wales. It was established to enhance the level of competition and showcase talent from these regions. The league typically runs from September to May, culminating in playoffs and a final to determine the champion. The Pro12 has evolved over the years, with changes in its format and sponsorship. It aims to promote rugby in the participating countries and provide a platform for players to excel. The league also contributes to the development of the sport at grassroots levels within the United Kingdom and Ireland.