This document provides an overview of the classification and characteristics of speech sounds in the English language. It examines the anatomy and physiology involved in speech production, including the roles of the brain, lungs, larynx, vocal tract and tongue. Speech sounds are classified based on their voicing, place and manner of articulation. Vowels and consonants are discussed in detail, along with different types of consonant sounds such as stops, nasals, fricatives and approximants. The document aims to outline key phonetic concepts to help teachers of English language learners understand speech sound production and identify potential problems.