Explain How a Financial Product Works Before You Buy It

The brochure makes it sound straightforward. The terms and conditions make it sound complicated. What you actually need is a plain-English explanation of what the thing does, when it works in your favour, and when it does not. This gives you that before you commit to anything.

Explain how {FINANCIAL_PRODUCT} (e.g. an ISA, a LISA, a stocks and shares account, a balance transfer card) works, in plain English, covering:
1. What it is and what it is designed to do
2. How you make money or save money through it (and under what conditions)
3. Any restrictions, penalties, or conditions that affect whether it suits your situation
4. Who it is NOT for (be specific about the circumstances that make it a poor fit)

No sales language. No recommendations. Explanation only. Under 250 words.