What is best first search in AI?

Best First Search is a search algorithm used in Artificial Intelligence that prioritizes exploring the most promising nodes based on a given heuristic. It evaluates nodes using a cost function, typically combining the cost to reach the node and an estimate of the cost to reach the goal from that node. This approach helps to efficiently navigate through the search space by focusing on paths likely to lead to the optimal solution. Common implementations include A* search, which uses a specific heuristic to ensure optimality and completeness.