PC identical image of the content

I own 2 laptops and I want to copy (to make an identical image of the content) on the other laptop as well. I don't know what is the name of the program you can do this with and which is used by IT programmers. i want to do the same image of the content from computer 1 to computer 2. I don't remember the name of that program which let you to do this. Can you help me pls?thank you