Placing marks/flags/stakes along a property line so that it may be seen on the ground. In order to ensure the location of the line, the property must be surveyed by the surveyor doing the marking.
In the course of a “regular” survey, the corners are identified and marked. However, the lines between the corners are not. This can be done at any time during or after the survey is completed. It may incur additional charges as it is not required to perform a survey. It is typically cheaper to have this done at the time of the survey as an additional trip would be required after the fact.