Depth of Field or DOF, is the term used to describe how much of the image is in focus.
There’s a bit of a myth (and people have said this to me) that you need a “really good camera” to capture a shallow DOF
It’s actually a combination of lens and sensor size!
But it’s largely controlled by how close you are to your subject, the closer you are, the more of the background will be out of focus (OOF)
With a blurred background, the subject of the shot will “pop” that’s to say, leap off the page
It’s a popular look for good reason, but not suitable for very single shot