What is the difference between an evap line and an indent line?

My friends are telling me this is an indent line. I’ve had a few positive ovulation tests which is rare for me since I have PCOS. So I took a pregnancy test along with an ovulation test tonight, and I see a line! It showed up in the 5 minute window. I have had a couple evap lines with these tests before, but they showed up around 30 min after the 5 min window. What is the difference between an indent and an evap line?