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"Something (such as a headline) designed to make readers want to click on a hyperlink especially when the link leads to content of dubious value or interest." (Merriam Webster). Some sample phrases/headlines which typically indicate clickbait are: "you won't believe what happens next", "the secret they don't want you to know", "this will shock you!".
"A situation in which an internet user encounters only information and opinions that conform to and reinforce their own beliefs, caused by algorithms that personalize an individual’s online experience." (Lexico)