URL parameters but ?mark is missing

I am new(trainee) to the web development and I just started studying its "language". I have to report every day to my boss but I have to use the correct terms. I have been reading about URL anatomy, in order to explain the fragments of this URL: https://www.c2ccertified.org/api_v2/search&username=rikotech&offset=50.

I see something that looks like query parameters to me: offset and username, but I don't see the question mark.

I don't know how to fragment(in correct terms) this part of the URL:

search&username=rikotech&offset=50

Are these query parameters? Because it seems to me that they serve that purpose - semantically. They filter the result from the API server.