Language is the means by which humans communicate with each other, be it through spoken word, gesture, or reading/writing. At its core, language is a complex system of abstract and arbitrary symbols (letters, sounds) used to communicate. Language is comprised of 5 different parts including morphology (how parts of words are combined), phonology (speech sounds and their organization), syntax (sentence structure), semantics (meanings of words), and pragmatics (social “rules” of language).
Children may experience difficulties in language, be it in their understanding of language (receptive language), or their use of language to express themselves (expressive language). Language disorders can occur/persist throughout the lifespan, and can be congenital or acquired (e.g. post stroke, post traumatic brain injury). SLPs can help preschool children with language disorders by developing their expressive language skills, increasing their understanding of language, and offering help with other ways of communication if needed (e.g. sign, augmentative alternative communication devices).
So much language is developed and embedded in play at this age, which is fun both for the child and for the SLP! Talking, reading, and encouraging preschoolers to ask questions about their play is a wonderful way to expand their language skills!