Why my laptop is getting hot?

My laptop is getting hoter how can i cool it down?

"When I turn on my laptop it's suddenly turn off I can't understand

How and why he turn off suddenly in few seconds"

this is probably because of dust in the heatsink of the laptop, heres a link to fixing this problem http://www.howtogeek.com/194479/how-to-c...

"My HP Elitebook 8540w was so hot I could have fried and egg on it. I went here and followed the instructions and it is cool now. Worth a try.

http://www.it-tutorials.net/hp-elitebook..."

How do you use your Laptop? maybe the board process too many applications try to uninstall the software that you didn't use if it doesn't work try to reseat all the Hardware components.. and clean the motherboard using brush.. also the Heatsink and try to replace the thermal paste..