Speech and language development represents one of the most important dimensions of early childhood development because it provides the foundation for communication, social interaction, learning, emotional expression, and later academic achievement. Although considerable individual variation exists in the age at which children acquire particular communicative skills, some children demonstrate a noticeable delay in the emergence or development of speech and language. Speech delay and language delay are sometimes used interchangeably in everyday discourse, although they refer to different aspects of communication. Speech delay primarily concerns the production and intelligibility of speech sounds, whereas language delay may involve difficulties in vocabulary acquisition, sentence formation, language comprehension, or the functional use of language. Early language delay, particularly when occurring in the absence of an identified developmental disorder, is frequently described as late language emergence or late talking. This article provides a theoretical and clinical review of speech and language delay during early childhood. It discusses normal speech and language development, conceptual distinctions, prevalence and developmental trajectories, major biological and environmental risk factors, clinical manifestations, assessment procedures, differential diagnosis, psychosocial and educational consequences, and evidence-based approaches to early intervention. Particular attention is given to the role of speech-language pathologists, families, hearing assessment, parent-implemented intervention, play, responsive communication, dialogic reading, and multidisciplinary collaboration. Current evidence suggests that although a substantial proportion of late-talking children eventually develop language abilities within the broadly expected range, early delay should not be dismissed because some children continue to demonstrate subtle or clinically significant difficulties in vocabulary, grammar, literacy, and academic performance. Consequently, systematic assessment, longitudinal monitoring, family participation, and individualized early intervention are essential components of effective clinical practice.