Conversational information seeking (CIS) is concerned with a sequence of interactions between one or more users and an information system. Interactions in CIS are primarily based on natural language dialogue, while they may include other types of interactions, such as click, touch, and body gestures. This monograph provides a thorough overview of CIS definitions, applications, interactions, interfaces, design, implementation, and evaluation. This monograph views CIS applications as including conversational search, conversational question answering, and conversational recommendation. Our aim is to provide an overview of past research related to CIS, introduce the current state-of-the-art in CIS, highlight the challenges still being faced in the community, and suggest future directions.

会话式信息搜索（CIS）涉及一个或多个用户与信息系统之间的一系列交互。CIS 中的交互主要基于自然语言对话，但也可能包括其他类型的交互，例如点击、触摸和身体手势。本专着全面概述了 CIS 定义、应用、交互、接口、设计、实施和评估。本专着将 CIS 应用视为包括对话式搜索、对话式问答和对话式推荐。我们的目的是概述 CIS 相关的过去研究，介绍 CIS 的最新技术，强调社区仍然面临的挑战，并提出未来的方向。