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The literature distinguished three types of service discovery methods such as,

1 Push-based Service Discovery (PUSD)

2 Pull-based Service Discovery (PLSD)

3 Hybrid-based Service Discovery (HSD)

PUSD: In PUSD, the service provider disseminates the services to all vehicles in the VANET milieu, does not wait for the requests from the VANET users. The PUSD is a proactive mode [15–22].

PLSD: In PLSD, the vehicle user transmits a request towards the service provider to find the specific service. The PLSD is a reactive mode [23–25].

HSD: The HSD uses both the PUSD and PLSD. HSD uses both proactive and reactive mode [26–29]. Table 2.1 depicts the characteristics of service discovery methods.