How can i find PIC chip ID?

hi,
i have a PIC18F4550, how can i understand what is this chip ID?

PICs have an individual ID for each chip?

Did you try searching Microchip's website for an answer first?

https://www.google.com/search?q=PIC18F4550
look at that, the first link, oh wait, first two, oh bah the whole page tells me about it

If you have a look at the "configuration bits" section of the data sheet there are usually 2 configuration registers that can be read by a chip programmer.

Some of the bits are used to identify the microchip part number, the other bits indicate the silicon revision number - which is important if you need to check the silicon revision errors for the part on the Microchip web site.