Figure 4.
The image displays a network visualisation illustrating the relationships between various topics in technology and customer service, featuring keywords such as sales, customer satisfaction, and machine learning. Each node represents a distinct concept, connected by lines that signify their relationships. The size of the nodes varies, indicating the significance or frequency of the keywords within the network. The connections are coloured according to years, ranging from 2018 to 2022, with a gradient from blue to green illustrating the temporal aspect of the data. The visual is created using VOSviewer software, which is indicated in the bottom left corner.Temporal overlay visualization map on keyword co-occurrence for the literature