The North Atlantic Oscillation (NAO) is a weather phenomenon that influences climate patterns in the North Atlantic region. It involves fluctuations in atmospheric pressure between the Azores High and the Icelandic Low. These changes can affect weather conditions in Europe and North America, leading to variations in temperature and precipitation. The NAO has two main phases: the positive phase, which typically brings milder winters and wetter conditions, and the negative phase, associated with colder winters and drier weather. Understanding the NAO helps meteorologists predict seasonal weather patterns and their impacts on ecosystems and human activities.