Here's a breakdown:
* It's not pronounced like "ch" as in "chair". That's a common mistake for English speakers.
* It's a soft "s" sound, similar to the "s" in "sister".
Examples:
* ça: (pronounced "sa") - meaning "this" or "that"
* façade: (pronounced "fa-sad") - meaning "front" or "exterior"
* français: (pronounced "frahn-say") - meaning "French"