Phonics is simply the system of relationships between letters and sounds in a language. When your kindergartener learns that the letter B has the sound of /b/ and your second-grader learns that “tion” sounds like /shun/, they are learning phonics.
Learning phonics will help your children learn to read and spell. Written language can be compared to a code, so knowing the sounds of letters and letter combinations will help your child decode words as he reads. Knowing phonics will also help your child know which letters to use as he writes words.
Your child will probably learn phonics in kindergarten through second grade. In kindergarten, children usually learn the sounds of the consonant letters (all letters except the vowels a, e, i, o, and u). First- and second-graders typically learn all the sounds of letters, letter combinations, and word parts (such as “ing” and “ed”). They practice reading and spelling words containing those letters and patterns. Second-graders typically review and practice the phonics skills they have learned to make spelling and reading smooth and automatic.