When giving a speech or presentation, sometimes it's necessary to deviate from the main topic and make a comment "in an aside." This phrase is often synonymous with "off-topic," "tangentially," "incidentally," or "by the way." These phrases are useful when wanting to add supplementary information that is only loosely related to the main topic. Other related words or phrases include "digress," "diverge," or "wander off-topic." Regardless of the specific word or phrase used, it's important to be mindful when making asides during a speech or presentation, as too many diversions can distract from the main point and confuse the audience.