It's a prefix that is often used to indicate movement or change from one state or position to another.
Here are some examples of how "trans" is used in English words:
* Transatlantic: across the Atlantic Ocean
* Translucent: allowing light to pass through
* Transplant: to move a plant or organ from one place to another
* Transport: to carry something from one place to another
* Translate: to change something from one language to another
* Transform: to change in form, appearance, or character
* Transgender: relating to people whose gender identity differs from their sex assigned at birth
As you can see, "trans" is a versatile prefix that can be used in many different contexts.