Subordinate clauses are dependent upon main clauses or other dependent clauses. They cannot stand on their own. Often they begin with words (subordinating conjunctions, relative pronouns or question words) that connect them to the main or independent clause.

"damit" (so that) is a conjunction that introduces a final clause. In other words, the clause reveals a purpose, intention or goal behind the action of the independent clause it links to. Clauses with "damit" answer the question ("Wozu?") (for what reason/purpose).

Examples:
Wir demonstrieren gegen das Experiment. – Zu welchem Zweck?
Wir demonstrieren gegen das Experiment, damit die Welt eine Zukunft hat.
(= Ich demonstriere. Mein Ziel ist, dass die Welt dann eine Zukunft hat.)

Clauses with "damit" usually follow the independent clause and are separated from it by a comma.

The conjugated verb goes to the end of a final clause.

Example:
Ich bin hier, damit ich mehr über das Experiment erfahre.