Your DigiD is your digital identification in the Netherlands. You need it to do pretty much anything concerning getting money from the government, or to tell the municipality that you’ve moved house. It works by linking your BSN number to a username and password you will be able to access most Dutch government websites.
You can apply for a DigiD online and doing so will save you time and money in the long-run. It is the first thing that we or the international student helpdesk have to ask for before we can help you. Be sure to keep your username and password in a safe place for future uses!