This is the sighted version that was marked on June 8, 2021. There is 1 pending change that needs to be sighted.

This article is about the online 3D infrastructure; for the band of the same name, see Second Life (band).

Second Life (German: zweites Leben, abbreviated "SL") is an online 3D infrastructure for user-designed virtual worlds (metaverse) available since 2003, in which people can interact, play, trade and otherwise communicate through avatars. In 2013, the system had around 36 million registered user accounts, and around the clock there were usually 30,000 to 65,000 users logged into the system at any one time. Information on more recent user numbers is not available. However, the number of active users and the media presence have steadily declined sharply in recent years. The number of users is said to have been only 800,000 in mid-2017.

Linden Lab gave the figure of 57 million registered accounts on its 15th anniversary in June 2018. How many of these are actively used is not known. In 2018, Second Life recorded 350,000 new registrations per month on average from 200 countries worldwide.

As a successor, Project Sansar was developed, which was originally supposed to be released in early or mid 2017. However, by mid-2017, it was only available to 10,000 select beta testers. At the beginning of 2020, Sansar was sold to Wookey Project due to lack of profitability and Linden Lab is thus focusing on the original version without VR again.

According to its own information, Linden Lab is working on an app to enable mobile use of Second Life.