The ISFJ personality type is not considered rare, as it is estimated to make up about 13% of the general population. However, it is important to note that rarity is subjective and can vary depending on the context or the specific population being considered.

ISFJ stands for Introverted, Sensing, Feeling, and Judging. Here is a detailed description of the ISFJ personality type:

1. Introverted (I): ISFJs tend to be more reserved and gain energy from spending time alone or in small groups. They often prefer to reflect internally before expressing their thoughts or feelings.

2. Sensing (S): ISFJs are detail-oriented and rely on their senses to gather information. They focus on the present moment and pay attention to concrete facts and practical details rather than abstract concepts.

3. Feeling (F): ISFJs make decisions based on their personal values and emotions. They are empathetic and considerate, often prioritizing the needs and feelings of others. They strive for harmony and are sensitive to conflicts or criticism.

4. Judging (J): ISFJs prefer structure and organization in their lives. They like to plan ahead, follow schedules, and complete tasks in a timely manner. They value stability and tend to be responsible, reliable, and conscientious.

ISFJs are often described as warm, caring, and dependable individuals. They have a strong sense of duty and are committed to fulfilling their responsibilities. They are excellent listeners and are often sought after for their support and advice. ISFJs are also known for their attention to detail, which makes them skilled at noticing and remembering practical information.

ISFJs are typically loyal and dedicated to their relationships, whether it be with family, friends, or colleagues. They are often seen as the "glue" that holds groups together, as they are reliable and willing to go the extra mile to help others. However, they may struggle with setting boundaries and prioritizing their own needs, as they tend to put others first.

In summary, while ISFJs are not considered rare, they possess unique qualities that make them valuable contributors to society. Their caring nature, attention to detail, and sense of responsibility make them reliable and supportive individuals in both personal and professional settings.