Learn Turkish: Bu yeni buluş, topluma önemli bir katkıdır. - This new discovery is an important contribution to society.

Hatta means 'even' or 'in fact' and is used to escalate or strengthen a point. You could expand the sentence by saying Bu yeni buluş, topluma, hatta tüm dünyaya önemli bir katkıdır (This new discovery is an important contribution to society, in fact to the whole world).

Why does the sentence end with katkıdır instead of just katkı?

The -dır suffix acts like the 'to be' verb (is/are) for stating general facts, objective truths, or formal definitions. While you could drop it in casual conversation, adding -dır gives this sentence a formal, definitive tone.

Why is toplum (society) in the dative case as topluma?

Just like in English where we say a contribution 'to' society, Turkish uses the dative suffix -a / -e to show the target or recipient of the contribution (katkı).

Why is the word order önemli bir katkı instead of bir önemli katkı?

In Turkish, when a noun is modified by both an adjective (like önemli) and the indefinite article bir (a/an), the word bir almost always sits exactly between the adjective and the noun.