Okay, so imagine you really want to build a really cool treehouse for you and your friends to play in. To make that happen, you need to convince your parents to let you use some of the family's money and time to build it. You need to create a plan, explaining what you want to build, why it's important, how much it will cost, and how long it will take to build.
Proposal software is kind of like a tool that helps grown-ups create plans like that for their job. Instead of building a treehouse, they might want to convince other people to give them money or hire them to do a project. Proposal software helps them write a really good plan that answers all the questions the other people might have.
It's kind of like a special program on a computer or website that has a lot of cool features to help grown-ups make their plans look really fancy and professional. They can add pictures, charts, graphs, and even videos to help explain their ideas. Plus, the software can save time, because it has templates and pre-written text that the grown-ups can use as a starting point.
Overall, proposal software is kind of like a cool tool that can help grown-ups make really good plans to convince other people to work with them or give them money.