"How is it" is usually used to inquire about the state, quality, or condition of something or a situation. It is a broad question sentence that can be used in a variety of different contexts. Here are some common uses and explanations:

1. Asking about the state of something: When you are interested in the state or condition of something, you can use "how" to ask about it. For example, you can ask about the quality of an item, the progress of a program, or the health of a person.

2. Asking for opinions or views: "How" can also be used to ask for someone's opinion, view, or assessment. For example, you could ask someone what they think about an idea, program, or decision, or ask them for their opinion on a topic.

3. Ask for guidance or advice: When you need guidance or advice, you can use "how about" to ask someone for help. For example, you could ask someone what action you should take in a particular situation, or ask them to give you advice on how to solve a problem.

In short, "how about" is a generalized interrogative sentence used to ask about the state, quality, opinion or advice of something. The exact meaning and interpretation depends on the specific context and question.