FAIR stands for Findable, Accessible, Interoperable and Reusable. The so called FAIR principle will help us to make the ICOS data available to more users, be it humans or machines. By following the FAIR principles we ensure that also in the long run ICOS data will remain available, can be found, understood and (re-)used by having the right metadata to go with it. You can read more at https://www.force11.org/fairprinciples/ or https://www.nature.com/articles/sdata201618.
[MH1]This is a bit oddly phrased – it makes me think of signing up for a data subscription service (rather than just creating a site account and profile). Which of these are you thinking of?