communication protocols

Hi guyz.....please let me know what is the difference between SPI, I2C, and TWI are they all same or I2C and TWI are same ??? please mention some details about the three of them

Here is a nice review: https://www.embedded.com/design/embedded/4023975/Serial-Protocols-Compared

For TWI, Wikipedia gives its history: https://en.wikipedia.org/wiki/I²C

The simple answer appears to be that I2C and TWI are essentially the same. I2C was both copyrighted and patented. The patents have run out and only the logo:



remains under copyright protection.

John