Free-floating planets (FFPs) are the lightest products of star formation and they carry important information on the initial conditions of the environment in which they were formed. They were first discovered in the 2000 s but still few of them have been identified and confirmed due to observational challenges. This is a review of the last advances in the detection of these objects and the understanding of their origin. Several studies indicate that the observed fraction of FFPs outnumbers the prediction of turbulent fragmentation and suggest that many were formed in planetary systems that were later abandoned. The JWST will certainly constitute a new step further in the detection and characterisation of FFPs. To interpret these new observations, precise ages for the nearby star-forming regions in which they were formed will be necessary.

自由漂浮行星 (FFP) 是恒星形成过程中最轻的产物，它们携带着有关其形成环境初始条件的重要信息。它们在 2000 年代首次被发现，但由于观测方面的挑战，仍然很少有人被识别和确认。这是对检测这些物体及其起源的理解的最新进展的回顾。几项研究表明，观察到的 FFP 比例超过了湍流碎片的预测，并表明许多是在后来被遗弃的行星系统中形成的。JWST 肯定会在 FFP 的检测和表征方面进一步迈出新的一步。为了解释这些新的观测结果，需要确定它们形成的附近恒星形成区的精确年龄。