The Tánaiste is the deputy head of government in Ireland, serving as the second-in-command to the Taoiseach, who is the prime minister. The Tánaiste is typically a senior member of the ruling political party or coalition and may oversee specific government departments. In the event that the Taoiseach is unable to perform their duties, the Tánaiste assumes their responsibilities. The role is crucial in maintaining governmental continuity and leadership.