Couchsurfing，可译为沙发冲浪、沙发旅行、当沙发客、搜索沙发，是一个旨在帮助旅行者与当地人创建联系的一个国际性非盈利网络。surf指的是在网络上快速、连续搜索数据，并不是指一般的冲浪，surf a couch 是指在网页中搜索会员，以提供沙发给游客过夜；但许多部落客直译为沙发冲浪，因此以讹传讹，导致今日大多数华人称之为沙发冲浪，但实际上与冲浪毫无关系。通俗地说就是当你旅行时你可以住在当地会员家；当有会员来你的城市时你可以接待他们住你家，以此达到既省钱又能进行文化交流的目的。如不能提供住宿，你还可以选择“出去喝一杯”，即做免费导游带他们逛你的城市。沙发客旅行世界各地的会员会举办各式各样的聚会，旅行者能参与其中，同样你也能在你的城市或你旅游到的城市邀请当地沙发客和旅行中的沙发客加入你举办的聚会。沙发客旅行网站也拥有众多的论坛，数万名活跃会员，每天都在相互尊重友好地气氛中讨论各种话题。

Couchsurfing International Inc. is a hospitality exchange and social networking website. The website provides a platform for members to "surf" on couches by staying as a guest at a host's home, host travelers, or join an event.

Couchsurfing International Inc refers to two separate legal entities. The first was founded in 2003 as a non-profit organization, and was liquidated in 2011. Its assets were sold to the private for-profit corporation Better World Through Travel, later renamed Couchsurfing International, Inc., which defines itself as “a mission-driven for-profit corporation”. As of August 2012, the company has raised $22.6 million in investment capital, while reporting no revenue.