The Application dimension of the Vaccine Delivery Devices market is divided into five primary sub‑segments: routine immunization programs, travel‑related vaccination, pandemic‑response campaigns, veterinary vaccination, and adult‑boost immunization. Routine immunization, which includes childhood and school‑based programs, accounts for roughly 45 % of market revenue, reflecting its large, recurring demand across both public and private health sectors. Travel‑related vaccination, driven by increasing international mobility, contributes about 15 % as airlines, travel clinics, and border health authorities procure single‑dose devices for short‑term use. Pandemic‑response campaigns, exemplified by COVID‑19 and influenza surges, represent 20 % of the market, with governments and NGOs scaling up procurement of auto‑disable syringes and prefilled injectors. Veterinary vaccination, serving livestock and companion animal health, holds 10 % of the market, leveraging devices adapted for animal anatomy and dosing. Finally, adult‑boost immunization, covering seasonal flu and booster doses for emerging pathogens, adds the remaining 10 %. This Vaccine Delivery Devices segmentation by application underpins the overall market size by aligning device design, volume, and pricing with distinct public‑health objectives.