Here is a list of the world's oceans, sorted by area:

1. Pacific Ocean - 165,250,000 square kilometers (63,800,000 square miles)
2. Atlantic Ocean - 106,460,000 square kilometers (41,100,000 square miles)
3. Indian Ocean - 70,560,000 square kilometers (27,240,000 square miles)
4. Southern Ocean - 20,327,000 square kilometers (7,848,000 square miles)
5. Arctic Ocean - 14,060,000 square kilometers (5,430,000 square miles)

The main difference between an ocean and a sea is their size and composition. Oceans are vast bodies of saltwater that cover more than 70% of the Earth's surface, and they are generally deeper and larger than seas. Seas are smaller bodies of saltwater that are partially enclosed by land, often connected to oceans. Seas are typically found along coastlines and are shallower than oceans. Additionally, seas often have unique characteristics, such as salinity, temperature, and marine life, which can differ from those of the ocean to which they are connected.
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