Use 'in demand' to refer to trends where specific items or services gain popularity quickly.

Market Trends

'In demand' can imply a temporary condition that may change over time.

Temporary State

Suggests a large number of people wanting something, not just a few.

Emphasizes the necessity or critical need for a service or skill.

Often used in job markets to describe professions with many openings.

Can express an urgent need for professionals or skills in certain situations.