The document by Dr. Pooja A. Deshmukh explains the concepts of phrases and clauses in grammar. It defines phrases as groups of words without a finite verb, categorizing them into noun, adjective, and adverb phrases, while clauses are defined as groups of words containing a subject and predicate, classified as main or subordinate clauses. The text further details the types of clauses, including noun, adjective, and adverb clauses, along with examples to illustrate their usage.