This is the 3073rd most frequent Russian word.
интернет
The global computer network for communication and information sharing.
In this sentence, the word 'интернет' is used in the instrumental case form 'интернетом' to indicate the tool or means by which the action is carried out.
Я часто пользуюсь интернетом, чтобы искать информацию.
I often use the internet to search for information.
Here, 'интернет' is in its nominative case, acting as the subject of the sentence, referring to the internet as the enabler of opportunities.
Интернет открыл множество новых возможностей для общения.
The internet has opened up many new opportunities for communication.
In this case, 'интернету' is in the dative case, indicating the recipient of the access.