What is the difference between USB and FTDI?

1, Definition and Properties
USB(Universal Serial Bus)：
Definition: USB is a serial bus standard that connects computer systems and external devices, and is also a technical specification for input-output interfaces.
Nature: The USB interface supports plug and play and hot swappable functions for devices, and is widely used in various fields such as personal computers, mobile devices, photography equipment, digital TVs, game consoles, etc.
Function: The USB interface is not only used for data transmission, but also provides power for connected devices.
FTDI(Future Technology Devices International Limited)：
Definition: FTDI is a Scottish private semiconductor equipment company specializing in the development, manufacturing, and support of USB technology.
Nature: FTDI's products are mainly used to convert RS-232 or TTL serial transmission into USB signals, in order to provide support for traditional devices in modern computers.
Function: FTDI chips and cables can easily convert USB signals to serial communication interfaces with devices such as microcontrollers, and are widely used in microcontroller development boards such as Arduino and ESP-01s.
2, Technology and Applications
Technical features: USB adopts a four wire cable, including two serial channels for transmitting data and two lines for providing power to downstream devices. The USB interface can automatically switch between high-speed and low-speed transmission modes according to the situation of the peripheral device, ensuring the efficiency and stability of data transmission.
Application areas: USB technology is widely used for the connection and communication of various electronic devices, including but not limited to personal computers, smartphones, tablets, external storage devices, printers, cameras, etc.
Technical features: FTDI chips have advantages such as high speed, stability, and ease of use, which can easily convert USB signals to TTL signals without the need for additional software installation, achieving plug and play.
Application areas: FTDI's products are widely used in situations that require USB interface conversion, such as interface conversion for microcontroller development boards such as Arduino and ESP-01s, as well as USB connections for wireless modems, barcode readers, smart card readers, and other devices.
3, Products and Solutions
The USB interface itself does not exist directly as a product, but as a connection standard between computer systems and external devices.
USB cables, USB hubs, USB flash drives, etc. are specific products developed based on the USB standard.
Main products: including FTDI chips (such as FT232R, FT2232D, etc.), FTDI cables, and FTDI converter modules.
Solution: FTDI provides a complete range of solutions for connecting devices with TTL level interfaces to USB interfaces, achieving seamless conversion from USB to serial communication.