Media planning is the process of directing advertising messages to the right audience. It involves determining audience and distribution objectives, as well as message weight, reach, frequency, and continuity. Media planners must decide which media to use, where, when, and how often based on concepts like the advertising response curve and relationships between reach, frequency, and continuity. They must also consider the 5Ms of the media mix: media, markets, money, mechanics, and methodology. Media buyers then negotiate placements based on indicators like brand development index and category development index. Advertising can be scheduled continuously, through flighting, or with pulsing strategies.