A domain's nameservers are the servers that hold the DNS zone and answer requests about where the website and email are located.
Setting the nameservers means deciding who manages the domain's records: the registrar, the hosting provider or a dedicated service. Changing them effectively moves the management of all records. That is why, before doing it, it is best to copy the current zone: we do this every day for the companies in Brianza and Como followed by our Cantù office.
