This is the 515th most frequent French word.
voici
"Here is" or "here are."
Here, 'voici' is used to direct attention to the keys, making their presence or presentation known.
Voici les clés que tu cherchais.
Here are the keys you were looking for.
This usage of 'voici' introduces Pierre, presenting someone to an interlocutor.
Voici mon ami Pierre.
Here is my friend Pierre.
In this context, 'voici' precedes an explanation or demonstration, drawing focus to the forthcoming information.