The security check is extremely important at every airport. Before you go through the staff check your passport and boarding card. Your hand luggage is then scanned. For security reasons dangerous and sharp objects (e.g. knives, scissors etc.) and liquids over 100 ml are not allowed on board.
While your hand luggage is being scanned you go through a metal detector. If it beeps a second check will be performed with a handheld detector. If everything is okay you are allowed to continue to your gate.
The rules on dangerous objects can be found here: dangerous objects