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Open data: what is it?

Open Data is data that anyone can access, use and share.

Open data becomes usable when made available in a common, machine-readable format.

It must be licensed and its license must permit people to use the data in any way they want, including transforming, combining and sharing it with others, even commercially.
For data to be open, it should have no limitations that prevent it from being used in any particular way.

Open data is measured by what it can be used for, not by how it is made available.

Aspects like format, structure and machine readability all make data more usable, and should all be carefully considered.

Data should be FAIR (Findable, Accessible, Interoperable and Reusable). 
Check here if your data are FAIR:
FAIR Principles - GO FAIR (
FAIR self assessment tool - ARDC

Some Open Data archives:

- Zenodo (link)
Figshare (link)
Google Dataset Search
- PubMed Dataset
- Polaris OS

N:B.: Please, be informed that if you have received founds by Horizon Europe, your data must be as open as possible. For more details please check the Horizon Europe faq.