InfluxDB, an open-source time series database, paired with Grafana, a visualization tool, can be utilized to analyze and display data trends over time, such as CPU load differences. The blog post details a step-by-step process for using InfluxDB's built-in difference() function to calculate the change in a value over a specified time duration, exemplified by a one-day difference in CPU load data. It explains how to construct an InfluxQL query to return the desired data, emphasizing the use of the difference() and last() functions within a SELECT clause, and the necessity of a GROUP BY interval to organize results by time. The guide further instructs on integrating this query within Grafana to visualize the data, highlighting the platform's versatility in handling various data sources. For those interested in exploring further, the post suggests referring to technical documentation and Grafana Cloud's offerings, including a free tier, for expanding one's data analytics capabilities.