This video is about antibodies preventing foreign antigens (also called pathogens) from connecting with cells in the body.
Notice the funnel-shaped green and purple antigens on the outside of the cells. These are used for recognition and attachment. The green Y-shaped antibody wants to prevent attachment of foreign antigens (large red blobs), so it joins with those antigens. Notice in the video that once the green Y-shaped antibody has joined to the antigen, the antigen can no longer bind to the cell.
What happens next is very exciting! A large phagocyte comes along and eats the antigen-antibody complex. The antigen is destroyed!
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