Dashboards show data from source reports as visual components that provide a snapshot of key metrics and performance indicators. Dashboards need to be refreshed manually or scheduled to run on a regular basis to reflect the most recent data from the reports. The running user of a dashboard determines whose security settings are applied when the dashboard is run. If the running user is different from the viewer of the dashboard, they may see different data based on their permissions and sharing settings.
References:https://trailhead.salesforce.com/en/content/learn/modules/lex_implementation_dashboards_and_repo

Explanation
Campaign influence is a feature that allows users to track how campaigns have influenced opportunities and measure the return on investment (ROI) of marketing efforts. Users can see which campaigns have influenced an opportunity on the related list and assign different attribution models to calculate the campaign influence.
References: https://help.salesforce.com/s/articleView?id=sf.campaigns_influence.htm&type=5