What exactly iPhone 2 Button Reset DO ?

Well,
Question is obvious in the topic. I really wonder what exactly restarting the phone using 2 buttons (home + power) ? What's the difference between using power button + slide to reset ?

Slide to turn off is like putting a laptop into hibernation.
What is in memory gets saved out so when you turn it back on it reloads where it was.
IF there was a memory leak in some program causing issues, then that would be loaded right back if you just powered off then on.
This is not correct.
It's not hibernation; neither process state nor memory state is saved. When you "slide to turn off" it flushes the cashes, closes open files and performs other shutdown tasks then completely powers off. RAM is cleared, and when you restart no programs are restored/reloaded. You can verify this by running any process monitoring app after you power back on - everything is restarted.
It's like hitting "shutdown" on your computer.
The difference is that the reset (hold sleep and home for 10 secs) does not run shutdown routines, close buffers, flush the caches, etc. or call shutdown. It just powers off the device spontaneously. It's like pulling the power plug on your computer while it's running. It's not a good idea to do this regularly.
It's best to "slide to power off" to power off/restart your phone, or when you encounter sluggish behavior, etc. Only hold both buttons to reset it if it's hung up badly enough that you cannot "slide to power off". This can happen if the OS in memory is corrupted badly enough.

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