YMYL is an acronym that stands for "Your Money or Your Life". YMYL is content that can have a direct impact on a reader's health, finances, safety, and, ultimately, their happiness.
Good YMYL content will be beneficial to a reader's life but bad content will have a resoundingly negative impact on their lives.
This means that the information needs to be deemed as correct by Google.
For digital marketers this is vital because Google takes the above responsibility quite seriously and presumes that only experts with experience will be authoring YMYL content.
Topics which fall into the YMYL category, according to Google, include:
Shopping information
Government, legal issues, social services, and other such topics
Medical advice
News and current events
Information on people