In North America, linguists generally recognize 58 language families and isolates. Understanding language families is one of the keys to understanding the historical relationships between the Indian groups. The Algonquian language family is a large American Indian language which is found in the Eastern Woodlands, the Plains, and California.
Linguists studying and comparing languages throughout the world have noted that some languages are similar to each other in terms of vocabulary, sound patterns, and grammatical structure. Using these comparisons, they group languages into language families. According to linguists Laurence C. Thompson and M. Dale Kinkade, in their chapter on languages in the Handbook of North American Indians:
“Language families are groups of languages that can be shown to be genetically related, using techniques developed by comparative linguistics.”