“Ratio of the probability of an event occurring in the exposed group versus the probability of the event occurring in the non-exposed group.”

Hypothetical EXAMPLE:

17% of smokers develop lung cancer

1% of nonsmokers develop lung cancer,

Then we can calculate the relative risk of lung cancer in smokers versus nonsmokers as:

Relative risk = 17% / 1% = 17.

Thus, smokers are 17 times more likely to develop lung cancer than nonsmokers”

https://www.ncbi.nlm.nih.gov/books/NBK430824/

OR=1 Exposure does not affect odds of outcome

OR>1 Exposure associated with higher odds of outcome

OR<1 Exposure associated with lower odds of outcome

In practice, the 95% CI is often used as a proxy for the presence of statistical significance if it does not overlap the null value (e.g. OR=1)

https://pmc.ncbi.nlm.nih.gov/articles/PMC2938757/