What does this c++ notation mean?

Question

C++ / C#

int main(int argc, char* argv[]){
char* filename = argc >= 2 ? argv[1] : "Image.jpg";

This is the first time I've seen such a post and I have no idea how to google it!
I study openCV C ++
link to all code from the lesson
If possible, then explain, if it takes a long time, at least give a link or tell me what it's called.
I have one idea is something like if else .

Answer 1

https://ru.wikipedia.org/wiki/%D0%A2%D0%B5%D1%80%D...

Answer 2

If the number of command line arguments is greater than or equal to 2 (the first argument is always present, the name of the program being called), then take the filename from the argument, otherwise use the default name.