Why do insects fly toward light?

Its 10:09 pm. I'm in my mom's room browsing the internet, mom told me to turn the lights off because she can's sleep with the lights on. but when i did all the insects came to the screen of my laptop bothering me all the time.

"Insect flying around my laptop screen"

I came up with this question: Why do insects fly toward light?

Based on what i've googled, this response exhibited by insects is due to phototaxis. 

Phototaxis  is a locomotory movement, that occurs when a whole organism moves in response to the stimulus of light.

There are 2 kinds of Phototaxis:

• Positive Phototaxis the movement is in the direction of increasing light intensity
• Moths, flies, and other flying insects

• Negative Phototaxis the movement is in the direction of decreasing light intensity
• cockroaches and worms

Aside from that, a lot were saying that insects use the light as navigation aid. For example a moth is heading north, the sun/moon will be its lights source,it will keep its navigation aid on one side of its body.

But if for an instance there is a nearer light source in the area aside from the sun/moon there is a big possibility that it will be confused and go to that nearer light source. Then  it would fly in an endless circle around the misidentified light source while attempting to keep it on their right side.