There are safety features, like airbags, and parts of your vehicle that need regular maintenance, such as refilling oil, are self-testing. The symbols that light up on your dashboard are alerting you that one of these features requires attention for your safety. It is important that you are able to identify these if they come up, to assess whether the issue requires immediate attention or not.
This is a general guide, please ensure you consult your handbook for any further information specific to your vehicle. Warning lights may be specific to your vehicle.