what does it mean? what other question been asked?
While I have had no personal experience at all recently (been there, done that, but that was years ago now), I can say that the nature, form, and scope of the standard PI (Program Integrity) interview has been consistent for many years, the differences lately being the fact that some interviews are now being conducted online, and not every adult applicant is interviewed (which is unlike before the pandemic when all adult applicants, with only special exceptions, were interviewed).
This is in reference to the PI Interview, which is part of "routine" processing. Applicants may otherwise also be required to participate in non-routine interviews. I assume your queries are about the typical, routine interview.
The primary subjects of the routine PI interview are about checking and verifying the supporting documents submitted with the application, including identity documents, status document (PR card), and travel documents (for most applicants this is about passports for most applicants -- basically confirming your identity and checking those documents.
The PI Interview is also to verify the applicant's ability in an official language. This is not a formal language test, but rather screening the applicant's ability to engage in the interview in either English or French. Most applicants do not even realize that they are being screened for language ability.
The scope of questions beyond that can and do vary considerably. Some applicants are asked very little more.
Many applicants (and this used to be almost all applicants in the past) are asked to verify no prohibitions (no criminal charges), and give current address and employment information. This is mostly a formality, and for most is related to screening to see how the applicant responds, largely to verify identity and discern credibility. NOT an interrogation in any sense.
Some applicants may be questioned extensively. It depends on whether the processing agent or citizenship officer conducting the interview has concerns or questions about any of the particular requirements. If, for example, IRCC discovered discrepancies in the information provided by the applicant, mistakes in travel history being fairly common, there may be questions about those particular things. One applicant reported, for example, that IRCC identified they failed to report one of their trips outside Canada, the applicant saw they had made a mistake, acknowledged the mistake (one three week absence left out of their travel history), but since the applicant applied with a big margin over the minimum and IRCC did not otherwise see reason to question let alone doubt the applicant's other information, no problem, and they were soon scheduled for the oath. However, a number of other applicant's have reported IRCC finding mistakes in the applicant's travel history, triggering more extensive questions, and for some also follow-up processing like requests for full copy of all passport pages, or the dreaded RQ (Residence Questionnaire).
Which is only to say how extensive the interview is can be very different for one person compared to another. If there is no reason to question the applicant's information, the interview is usually short, simple, polite, not at all confrontational. For most it goes fast, done before you blink.