This is the 2436th most frequent German word.
reisen
To travel.
Here, 'reisen' is used in the present tense to describe the action of traveling in a personal context.
Ich reise gerne in andere Länder.
I like to travel to other countries.
In this sentence, 'gereist' is the past participle of 'reisen,' used in the perfect tense to indicate a completed action in the past.
Letztes Jahr sind wir nach Italien gereist.
Last year we traveled to Italy.
Here, 'reisen' is used in the infinitive form to describe a future action as part of a plan.