The phrase "in request" can be interchanged with several other terms that convey a similar meaning. For instance, one might use the term "in demand" to refer to something that is being widely sought after by many people. Another option is to use the word "popular" to describe something that is very well-liked or widely used. Similarly, "highly sought-after" can convey the notion of something being desired and in demand. Other possibilities might include "coveted," "wanted," "desired," "sought," or "prevalent." Regardless of the term used, the meaning conveyed is one of something being desirable or sought-after, indicating its importance or value to those who seek it out.