This article summarizes the basic notions of Information Structure (IS), focusing on Focus, Givenness, and Topic. IS is concerned with features of language that relate to the Common Ground (CG), the shared knowledge between interlocutors. Focus indicates alternatives relevant to interpretation, with two types: expression focus (on linguistic forms) and denotation focus (on meanings). Givenness indicates that a denotation is already present in the CG, while Topic specifies what a statement is about. The article introduces Delimitation, which includes contrastive topics and frame setters, and notes that rhetorical structuring is part of IS. Focus is defined as indicating alternatives relevant to interpretation, and can be used for both packaging and content construction. The article discusses semantic and pragmatic uses of focus: semantic uses affect truth conditions, while pragmatic uses relate to CG management. Examples show how focus can be used for correction, confirmation, parallel structures, and delimitation. Givenness refers to the presence of a denotation in the CG. Anaphoric expressions, deaccentuation, deletion, and word order can indicate givenness. Givenness and focus are complementary, with focus often overriding givenness in accentuation. Topic is the entity about which information is given. It is related to the psychological subject and predicate, and is central to communication. The article discusses how topics are introduced and how they relate to CG content and management. The paper highlights the importance of IS in understanding how language is used to manage and structure communication.This article summarizes the basic notions of Information Structure (IS), focusing on Focus, Givenness, and Topic. IS is concerned with features of language that relate to the Common Ground (CG), the shared knowledge between interlocutors. Focus indicates alternatives relevant to interpretation, with two types: expression focus (on linguistic forms) and denotation focus (on meanings). Givenness indicates that a denotation is already present in the CG, while Topic specifies what a statement is about. The article introduces Delimitation, which includes contrastive topics and frame setters, and notes that rhetorical structuring is part of IS. Focus is defined as indicating alternatives relevant to interpretation, and can be used for both packaging and content construction. The article discusses semantic and pragmatic uses of focus: semantic uses affect truth conditions, while pragmatic uses relate to CG management. Examples show how focus can be used for correction, confirmation, parallel structures, and delimitation. Givenness refers to the presence of a denotation in the CG. Anaphoric expressions, deaccentuation, deletion, and word order can indicate givenness. Givenness and focus are complementary, with focus often overriding givenness in accentuation. Topic is the entity about which information is given. It is related to the psychological subject and predicate, and is central to communication. The article discusses how topics are introduced and how they relate to CG content and management. The paper highlights the importance of IS in understanding how language is used to manage and structure communication.