Popups are interruptive messages that appear on websites, often causing frustration for users. To avoid this, website owners can explore alternative options to popups. Some synonyms for popups include slide-ins, modals, overlays, lightbox, and notifications. Slide-ins are a less intrusive approach that appear from the side of the screen. Modals and overlays are similar to popups, but they are visually different and may not cover the entire screen. Lightboxes are a less obtrusive style of popup that appear within the page without disrupting the flow of content. Notifications appear in the corner of the screen and inform users about updates without disrupting their browsing experience.