The PlayStation 4 or the PS4 as people call it is the latest PlayStation released by Sony in the month of November in 2013. As far as specs are concerned, the processor used is an octa-core Jaguar chip, while the GPU used is an AMD based 1.84 TFLOPS graphics engine. The RAM memory used is that of an 8 Gigabyte DDR5 type.
What it brings to the table
Based on the specs alone, one can imagine the increase in performance over the PS3. This allows for games with higher requirements and better graphics to be built for this platform. In fact, over the course of these 3 years since its release, a lot of games have already done that, some of them being GTA V, The Last of Us, and Infamous: Second Son and the newly released Bloodborne.
Was it necessary?
Yes, by all means! The PS3 was released way back in 2006, and it was high time that an upgrade was made on that. There were tons of PC games which are ported over to consoles, simply did not reflect the true capability of that game. For instance, Battlefield 4 on the PS3 was capped to 30 fps and 24 total players in the online mode. So in that regard, it was definitely a necessary upgrade.