Nativism, also known as the Universal Grammar Theory, suggests that humans are born with an innate capacity for language, including a set of universal grammatical principles.

Noam Chomsky's Universal Grammar Theory posits that all human languages share a common underlying structure and principles.

Interactionism, also known as the Social Interactionist Theory, stresses the importance of social interactions and environmental factors in shaping language development.

B.F. Skinner's Operant Conditioning Theory posits that language is acquired through reinforcement and punishment, where desired behaviors are reinforced and undesirable behaviors are discouraged.

Constructivism emphasizes the active role of the learner in constructing knowledge and understanding, including language, through their experiences and interactions.

Lev Vygotsky's Zone of Proximal Development theory suggests that language learning occurs most effectively within a range of abilities where learners can receive guidance and support from more knowledgeable individuals.

Interactionism, particularly the sociocultural approach, emphasizes the role of scaffolding in language acquisition, where adults or more knowledgeable peers provide temporary support to help learners develop their language skills.

Speech Perception refers to the ability of infants to distinguish between different speech sounds, even those not present in their native language, demonstrating their innate capacity for language.

The Holophrastic Stage is the early stage of language acquisition where children use single words to represent entire thoughts or ideas.

Telegraphic Speech refers to the stage in language acquisition where children produce simple sentences, often omitting grammatical markers like articles and prepositions.

Overgeneralization is the tendency of children to apply grammatical rules too broadly, resulting in errors like using "goed" instead of "went".

Morpheme Acquisition refers to the stage in language acquisition where children begin to acquire and use morphemes, the smallest units of meaning in a language, such as prefixes, suffixes, and root words.

The Input-Output Theory suggests that language acquisition is influenced by the frequency and consistency of input, as well as the clarity of speech.

Echolalia refers to the ability of infants to imitate speech sounds and gestures, even before they fully understand their meaning.

Sociocultural Theory emphasizes the role of social and cultural factors in shaping language acquisition, including the influence of family, peers, and the broader community.