Can anyone explain some unfamiliar terms in PS Vita for a beginner gamer like me? [closed]

Solution 1:

2000

This refers to both the model of the Vita as well as where it was released. The 2000 model you were looking at was the Vita PCH-2000. This Reddit post explains that the 2000 model is the one released in Japan, compared to the 2001 for the US, the 2003 for the UK, and the 2006 for general Asia. So they will be the same feature wise, just from separate regions.

Jailbreak

This refers to the process of using an exploit in a device to gain higher access/privileges than one would normally be allowed on that given device. This generally allows a user to modify the operating system or install applications in ways that aren't generally allowed by the operating system.

Note: There are generally risks associated with jailbreaking a device and it is extremely important to look into these risks before going forward with the process on any device.

3.68

This refers to the version of the firmware that the Vita is running. When someone says that they have a "Vita Slim 3.68" it means that it's running firmware version 3.68. This version is significant for some as it represents the final version where the popular Jailbreak h-encore can run.

In Conclusion

Whether or not you want to buy a Japanese Vita is up to you, this GameFAQs thread explains what some of the differences are between the Japanese and American Vitas.

When someone says they're selling a Vita Slim 3.68 Jailbroken, it most likely means that they're using h-encore or a similar program to install patches alongside the operating system that will come with the system when purchased.