Timelion is a powerful visualization tool within Kibana designed for analyzing time series data using a unique syntax-driven approach, allowing users to chain functions to create complex graphs. Unlike traditional visual editors, Timelion's syntax enables users to draw data from different indices or sources into a single graph, offering capabilities that classical Kibana visualizations may not support. Users can manipulate data through various functions like .es for Elasticsearch queries, .wbi for World Bank data, and styling functions for customizing graph appearances. Timelion supports mathematical operations, conditional selections, and function chaining to modify data series, offering advanced features like trend lines, multiple time series comparisons, and different scaling options. While Timelion provides extensive capabilities for time series visualization, Kibana's newer Time Series Visual Builder offers a graphical alternative with overlapping functionalities, providing users with options to choose based on their specific requirements.