What is the access time in Unix

Question

I want to know what access time is. I searched in the web but got the same definition:

read - gets changed

I know with touch

Answer 1

Last access time

• Time when file data last accessed.
• Changed by the mknod(2), utimes(2) and read(2) system calls.

Last modified time

• Time when file data last modified.
• Changed by the mknod(2), utimes(2) and write(2) system calls.

Last changed time

• Time when file status was last changed (inode data modification).
• Changed by the chmod(2), chown(2), link(2), mknod(2), rename(2), unlink(2), utimes(2) and write(2) system calls.