Concurrent jurisdiction refers to the situation where two or more courts have the authority to hear and decide a case involving the same parties and issues. This concept allows for flexibility in the legal system, as it enables litigants to choose between different court systems, whether state or federal, based on factors such as convenience or perceived advantages. Understanding concurrent jurisdiction is important, especially when considering how it interacts with concepts like express and implied preemption, which determine the extent of federal versus state power in legal matters.