Kelps are large seaweeds (algae) belonging to the brown algae (Phaeophyceae) in the order Laminariales. There are about 30 different genera.

Kelps grow in underwater "forests" (kelp forests) in shallow oceans, and is thought to have appeared in Miocene, 23 to 5 million years ago. The organisms require nutrient-rich water with temperatures between 6 and 14 °C (43 and 57 °F). They are known for their high growth rate — the genera Macrocystis and Nereocystis can grow as fast as half a metre a day, ultimately reaching 30 to 80 metres (100 to 260 ft).

Through the 19th century, the word "kelp" was closely associated with seaweeds that could be burned to obtain soda ash (primarily sodium carbonate). The seaweeds used included species from both the orders Laminariales and Fucales. The word "kelp" was also used directly to refer to these processed ashes.

Read more about Kelp:  Morphology, Growth and Reproduction, Commercial Uses, As A Possible Renewable Energy Source, Kelp in History and Culture, Conservation, Gallery, Commercial Kelp Production in China, Prominent Species, Interactions

Other articles related to "kelp":

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... for in shallow coastal waters and among kelp beds ... It builds a nest from kelp, sticks, bones and lines it with kelp or feathers ...
Kelp - Interactions
... Some animals are named after the kelp, either because they inhabit the same habitat as kelp or because they feed on kelp ... These include Northern kelp crab (Pugettia producta) and graceful kelp crab (Pugettia gracilis), Pacific coast of North America ... Kelp goose (kelp hen) (Chloephaga hybrida), South America and the Falkland Islands Kelp pigeon (sheathbill) (Chionis alba and Chionis minor), Antarctic ...
Bull Kelp
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Loxechinus Albus - Biology
... albus is mostly found on rocky coasts associated with the kelp Macrocystis pyrifera ... does not seem to be limited by the quantity of algae available nor does the kelp growth become excessive ... on drifting algal fragments which are always abundant in kelp beds ...