The Critical Period Hypothesis (CPH) is a theory in linguistics that suggests there is a biologically determined period during childhood when language acquisition is optimal.

Typically ending around puberty, during which individuals are most receptive to learning languages and can achieve native-like proficiency more easily than at any other stage of development.

Phonology: The CPH suggests that language learners are most adept at acquiring the sounds and phonological patterns of a language during the critical period.

Syntax : . According to the CPH, children have a heightened ability to internalize the syntactic structures of a language during the critical period, enabling them to produce grammatically correct sentences with relative ease.

Semantics : The CPH suggests that children are particularly adept at grasping the semantic nuances of a language during the critical period, acquiring vocabulary and understanding contextual meanings more readily than adults.