You will be met at the air-bridge, escorted to through any visa, quarantine, transit, security, immigration, baggage, customs procedures; then you will be led to the next flight’s check in area, or to flight transfer desk, or to your airline lounge or to the boarding gate.
If a change of terminal is required the greeter will normally accompany you between terminals. The airport shuttle or transfer system will be used to move between terminals.
In some airports “international to international” connection may not be permitted solely within the transit area. In other airport the flights might be arriving or departing in different and remote terminals. Or maybe a low cost “point to point” carrier’s flight might be involved. In this cases the airport layout, regulations or airline interline agreements may require you to pass through immigration, collect your bags and check in again. Each request will be evaluated case by case and a solution will be will be suggested and quoted at the time of booking.