All matter such as solids, liquids, and gases, is composed of atoms. Therefore, the atom is considered to be the basic building block of matter. However, atoms are almost always grouped together with other atoms to form what is called a molecule. Only a few gases such as helium are composed of individual atoms as the structural unit. Atoms are extremely small.
What is the Difference between USB Type A and USB Type B Plug/Connector? In the Catalog for USB-232/485 Series Interfaces, it says that the 1-port interface has a USB Type A plug whereas the 2- and 4-port interfaces have a USB Type B connector. What is the difference?
USB 2.0 is a version of the USB standard, and probably the most widely available one. USB 1 is old and never really caught on. USB 3 is new, very high performance, and is only just becoming widely available. It is 10 (USB 3.0) or 20 (USB 3.1) times faster than USB 2. USB Type C is new connector for USB. Traditionally USB used a Type A connector on the Host (computer) and a Type B connector on the peripheral (phone etc), There were several variants of the Type B, of which the most familiar is the Type B micro used on most mobile phones. Both Type A and Type B had variants to carry the extra conductors for USB 3.