Telephony refers to the technology and equipment used for voice communication over a distance. While landline telephones were once the standard, mobile phones and VoIP (Voice over Internet Protocol) have revolutionised telephony, offering greater flexibility and reach. Telephony systems include both traditional and modern phones, from basic landlines to smartphones with advanced features. VoIP technology enables calls over the internet, providing an affordable and scalable option for businesses and individuals. With the rise of mobile communication, telephony services have become more integrated into daily life, offering not only voice but also video calling, messaging, and conferencing. Telephony continues to evolve with advancements in 5G and cloud-based services, offering improved call quality and faster connections.