This article provides an in-depth overview of the three major types of linguistic corpora: general corpora, specialized corpora, and parallel corpora. Each type serves distinct purposes in linguistic research, language teaching, lexicography, translation studies, and natural language processing. The paper highlights their features, structures, and applications, illustrating each with real-world examples such as the British National Corpus, the Corpus of Contemporary American English, ICLE, PubMed Corpus, and the Europarl Corpus. Understanding these corpus types enables researchers and students to select appropriate resources for their linguistic studies. Keywords: corpus linguistics, general corpus, specialized corpus, parallel corpus, language research, translation studies, learner corpora