Updates are really important for several reasons: firstly, they solve problems with the software. For example, no software is perfect and runs smoothly all the time, but the software manufacturer often identifies problems thanks to users feedback and will solve (hopefully) the problems. These are known as bugs.
Secondly, if its more serious stuff, like your operating system or communications software like your e-mail, then it can solve security holes in the software. These holes, in theory, need to be plugged from ...
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