A DDoS server attack is when many requests are sent to a website at the same time. Such attacks can paralyze the WordPress site and, as a result, the work of the company. All types of websites can be attacked: media, banks, medicine, government, online stores and other business areas.
For my part, I can offer basic protection against DDoS attacks on the WordPress server. I will try to make it easier for the attacked site to breathe during the attack. Attack levels vary, so I may not always be able to help.