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Wireless networks are standing at threshold of 5G which will revolutionize the world with its new facets. With the proliferation of 4G and 5G, efforts are being made to focus on user centric approach, high reliability, more security and low latency. With an aim of connecting the world through World Wide Wireless Web (WWWW) and providing customers with best Quality of Service (QoS) and Quality of Experience (QoE), 5G will soon be a part of our daily life. These upcoming networks are based on the integration of heterogeneous networks to satisfy user demands for seamless mobility. For the mobile users, during handoff its mobile terminal terminal switches between different networks either due to technical or performance issues. We have categorized the handoff strategies into seven groups which will offer a researcher with an insight of efficient handoff management schemes. A detailed classification is presented about handoff types on the basis of four categories. This paper also focuses on active research initiatives and future work in the area of handoff in Next Generation Heterogeneous Networks and reveals few challenges which still exist and hinder in providing seamless services during mobility.