All the letters in the alphabet apart from A, E, I, O, and U (called vowels) are known as consonants.
[show me the consonants]
A consonant is a letter of the alphabet which represents a basic speech sound produced by obstructing the breath in the vocal tract. For example:
T is pronounced using the tongue (front part)
K is pronounced using the tongue (back part)
B is pronounced with the lips
H is pronounced in the throat
F is pronounced by forcing air through a narrow gap
M is pronounced using the nasal passage
A consonant can be combined with a vowel to form a syllable.
Use a before a consonant sound, and use an before a vowel sound. (NB: The important word here is sound. A word which starts with a vowel letter could start with a consonant sound (e.g., unicorn starts with a y sound) and vice versa.) For example:
She was injured in a RTA.
She was injured in an RTA.
(R is a consonant, but it starts with a vowel sound.)