Employers are looking for employees who can communicate well with other people. Strong communicators make good team members (see teamwork) because they can efficiently and effectively transfer information from person to person, follow instructions and instruct other people.
Strong communicators generally also make good leaders (see leadership) and decision makers (see decision making), which makes communication a key competency.
It is likely that you will need to show evidence of your own communication skills during a competency based interview. Questions you may be asked include:
For further information see Competency Based Questions, Competency Based Interview and General Interview Advice.