Samsung Galaxy Core is a budget 1GB ram device from samsung released in June 2013. It was a decent device when it was launched,but now,for the price you can get far better devices.
Display : 480 x 800 pixels, 4.3 inches ie only 217 ppi. The screen brightness is not that great,which means it is very difficult to see the screen under sunlight. The viewing angles are good.There is also no light sensor which means Auto brightness feature is not there.
Processor : Dual-core 1.2 GHz Cortex-A5 processor. This is no powerhouse Good enough for your day to day tasks,but lags behind the quadcore processors coming with similarly priced devices like Canvas Magnus, Turbo Mini,Xolo Q Series, Moto G etc.
Antutu Benchmark : 7470 ( For a comparison to show how low the performance is, Xolo Q700 scores - 13000, Micromax Turbo Mini - 17000 )
Camera : 5 MP , the image quality is not that great. It can't even record 720P HD videos while even many under Rs 8000 devices are able to.
Operating System : Samsung TouchwizUI on top of old Android 4.1 Jellybean.
Battery : 1800mAh. This is NOT good enough to take you through one day of moderate use (with internet on). Cheaper Xolo Q700 priced at Rs 8500 ships with a 2400mAh one is to be noted.
Verdict : Galaxy Core is not a value for money device in my opinion, as many other devices coming at this price ships with far better performing components and newer Android version. Buy this only if you want a 'branded' budget device and are ok with the issues it comes with.