db,
Seared means to brown/scorch over very high heat. Not quite Blackened Cajun hot, but pretty close.
It seals in the flavor and juices and prevents lean cuts of meat/poultry or fish from drying out.
Oily fish or fatty meat and poultry you can fry with little or no oil in a non-stick pan and they'll be okay.
A lean piece of meat, like a pork loin chop/ non-marbled beef, you sear quickly on both sides and turn down heat, sometimes you would cover with a lid in on a fry pan, or in restaurants they'll put the seared fish/meat in a oven to finish cooking.
You see them doing with large cuts of meat like pot roast all the time on the cooking shows. By searing all 4 sides until caramelized, you lock in the juices and then you roast slowly in oven.
IF you have thin enough fish fillets, a quick sear on both sides will cook the fish enough. The tricky part comes if the fillets are thick. Then you can end up with the fish appearing done, but when you bite in, you have that "sushi" experience

The biggest mistake people make is trying to turn the fish/meat before its caramelized, or moving it around with your spatula. That's really important with fish, because until it's seared/caramelized evenly, it will break apart when you try to turn it.
Best thing to do, is give the skillet a little shake when you can see the edges of the fillet curl a little. If the fillet is seared evenly, it will slide easily in pan and it's ready to turn over.
My vote is for baked, as I like Lakers in foil anyway you want too make them.