I have a macbook i bought in 2011.  Should I update my operating system.

Im using osx 10.6.8 on a mac book bought in 2011.  should i update?  obviously I don't know much about this stuff.  Any help would be great.

Reasons to update include:
1. New features that are useful to you.
There are many new features between 10.6 and 10.10. Many of them involve iCloud, which allows syncing of content across your Apple devices. Some involve efficiency, increasing battery life and reducing CPU load.  You can find reviews of each of the OS versions since SL online. Read them, and see if you think the features are of use to you.
2. Compatibility with application software that you want to run.
If you need to use particular apps, then you might want to use the latest versions, and they may require using a newer OS.
3. Bug fixes and security.
Whilst no release is bug-free, there is a general movement to get bugs fixed. Yosemite has benefitted from the public beta to have a lot of issues reported and fixed. It also includes security fixes that prevent malware from attacking your computer.
Reasons not to update:
1. Older software may not work at all or well on a newer OS.
You will have to make sure that all your applications, hardware drivers and other software is compatible with Yosemite. This may involve having to buy new versions. Snow Leopard is the last version that can run old PPC software, written for pre-2006 Macs.
2. Things are different!
A lot of changes have been made to the interface since SL. You will need to get used to them.
You could always install Yosemite on an external drive, and give it a test drive!

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