Here's a breakdown:
* Semantics focuses on the meaning of words, phrases, and sentences. It explores how words relate to the objects and concepts they represent, as well as how they interact with each other to create meaning.
* Lexical semantics is a branch of semantics that specifically deals with the meaning of individual words. This includes understanding the different senses of a word (polysemy), how words relate to each other (synonymy, antonymy), and how words change meaning over time (historical semantics).
* Sentential semantics examines the meaning of sentences, taking into account the meanings of the individual words and how they are combined to convey a complete thought.
Semantics is a complex and fascinating field, and its study has applications in many areas, including linguistics, psychology, philosophy, and computer science.