Raspberry Pi was a revolution on low-cost computers. You could have an SBC for around € 30 with great potential. Makers and the education sector have been the two most benefited. There are a lot of DIY projects to do with one of these cheap boards, and you can learn a lot from them, such as how a supercomputer works by creating a Raspis cluster ...
Well now the Raspberry Pi Foundation has revamped its hardware. There are a new board out, the Raspberry Pi 4. This SBC (Single Board Computer) have flourished after the success of the Raspi, and many other manufacturers have taken advantage of the wave to create their own similar boards with the original or with some changes, better performance, new functionalities, etc. But the Raspberry Original Pi is still the queen.
For about $ 35 or € 35, this buy the new Raspberry Pi 4 Model B. It is likely that other derivative models will also appear soon as has happened with their predecessors. You now have a USB-C socket for power, 2x micro HDMI ports with support for two 4K monitors or displays, 2x USB 2.0 and 2x USB 3.0 ports, also an Ethernet port. Other features such as the 40 GPIO are kept for your projects.
As for the RAM memory, now you can choose between different capacities with 1, 2 and 4 GB. The processing chip has also been replaced by a more powerful one. It is rare that they have chosen to remove the RAM from the SoC ... to give the possibility to choose between several capacities while maintaining the same SoC SPEC, but the truth is that it is a good idea to satisfy the different needs of the users.
The core chip is now a Broadcom BCM2711 with an ARM Cortex-A72 CPU at 1.5 Ghz and four cores processing. It also integrates a more powerful GPU, with support for 4K and they promise support for H.265 multimedia for 4K60p, H.264 1080p60 and 1080p30, compatible with the OpenGL ES 3.0 graphics API. So you can expect more performance and agility to run the vast number of available operating systems and distributions.