The world's oceans constitute the largest interconnected body of water on Earth, covering roughly 71% of the planet's surface. These vast aquatic environments are characterized by extreme salinity and exhibit profound physical and chemical stratification across various depths, including distinct thermal and oxygen gradients. Oceanography studies these massive systems, which function as critical global regulators by absorbing atmospheric heat, dissolving considerable amounts of carbon dioxide, and driving global currents. The diverse physical and chemical conditions support immense biodiversity, sustaining complex marine ecosystems that are essential for global climate stability and nutrient cycling.