Its data communication is unidirectional or half-duplex.
Communication Architect: USB 2 has 4 wires inside the cable. So, it can be clearly said that USB 3 port is much efficient in terms of power consumption. So, USB 3 devices can provide more power when needed and also can conserve power when it remains idle. Power Consumption: Power provided by USB 2 is up to 500mA but USB connection provides 900mA. Speed Improvement: Transfer speed rate of USB 2 is 480 Mbps whereas transfer rate of USB 3 is 4.8 Gbps which is 10 times faster than the bandwidth of USB 2 port. So, usb 2.0 vs 3.0? Internally, USB 2 has 4 wires where USB 3 has 9 wires. USB 3 is generally colored Blue on inside to distinguish it from USB 2. Physical Difference: Both USB 2 and USB 3 are physically different. Nowadays, it has become more popular than USB 3.0. USB Type C Connector : It is the latest craze. The working principle is the same as USB 3.0. USB 3 cable can be of a maximum 3 meters long. So, it is possible to power more devices from one hub. Power usage is up to 900 mA that allows more power efficiency with less power. USB 3 is generally more expensive than the same kind of USB 2. It is full-duplex which means it can send and receive data simultaneously. Its maximum data transfer speed is about 5 Gbps(Gigabits per second). USB 3 or Universal Serial Bus 3 connector type or Super-speed USB 3 was released in 2008. 
USB 2 cable can be of maximum 5 meters long. Power usage is up to 500 mA which is not that efficient.USB 2 is generally less expensive than the same kind of USB 3.It is half-duplex which means it can send or receive data at a time.
It has a maximum data transfer speed of 480 Mbps. USB 2 or Universal Serial Bus 2 or High-speed USB-2 was released in 2000. In your smartphone, you’ll find micro-USB. PC and laptops have generally standard shapes. Standard, Mini, or Micro variations are available in all versions of USBs. The USB connector has many sizes and shapes. USB Versions (Protocol + Connector Explained) Variations of USB Connector USB Connector Types
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