The International Phonetic Alphabet (IPA) is a system for showing how we use different sounds that a conventional alphabet for written language cannot do
The consonant sounds can be grouped by how they are articulated in the mouth
All consonant sounds involve the restriction of airflow by articulators: either the lips coming together (labial), or the tongue being positioned against the teeth (dental) or in some part of the roof of the mouth (alveolar ridge, hard and soft palate)