4G is the next generation of technology that the International Telecommunication Union has created for transferring data via the Internet. The speed is 100 MB/s downstream and 50 MB/s upstream, with a bandwidth of 20 MHz. The idea that used to wield the great value of 4G format that society is consuming more video and heavy images and this will make the mobile phone supports it. A continuación show you a small graphic comparison between 3G and 4G in the most common uses computer-related.

VDC would be the abbreviation for Volt Direct Current which translated would volts direct current. The idea of ??this type is unidirectional current to the load. Direct current is normally produced by batteries, thermocouples, solar cells and a dynamo electric machine type. The direct current can flow in conductors such as wires, but may also flow through semiconductors, insulators ... In the image: 1 - current per pulse 2 - Direct Current (DC) 3 - Alternating Current (AC) 4 - Variable Current

Thunderbolt is called the cable used by Apple for the transmission of video, considered one of the fastest technologies for laptops in terms of data transmission.

Its development is based on the PCI Express and Displayport architecture.

They are capable of transferring data, high definition video and voltage. Able to reach up to 10 Gb/s in both directions, a speed 20 times faster than a USB 2.0 or 12times faster than a firewire cable.

Currently we can find Thunderbolt technology with 10 GB/s, Thunderbolt 2 with speeds higher than 20 gb/s and Thunderbolt 3 with speeds of 40 GB/s and up to 15 W of voltage.

With Thunderbolt 3 we will have compatibility with HD devices like 4k or 5K screens.