What is juxtaposing in film?

Can you please elaborate on the concept of juxtaposing in film? I'm curious to understand how it's used to create a sense of contrast or tension within a scene or sequence. How does juxtaposing impact the audience's emotional response and overall understanding of the narrative? Are there any specific examples of films that utilize juxtaposing effectively, and what are the key elements that make these examples stand out? I'm looking forward to hearing your thoughts on this fascinating aspect of filmmaking.