RTA stands for "Ready to Assemble". It's like when you buy a toy or a puzzle that comes with a bunch of pieces that need to be put together to make the final product. RTA furniture is kind of like that, but for bigger things like cabinets or desks.
RTA furniture comes in a box with all the pieces you need to make the final product. You'll also get instructions that show you how to put all the pieces together to make the final product. The pieces usually have pre-drilled holes and other features that make it easy to put everything together without having to do a lot of measuring or other complicated tasks.
Overall, RTA furniture is a great option if you're looking for something that's easy to put together yourself and can save you money compared to buying pre-assembled furniture. Just remember to follow the instructions carefully and use the tools provided to make sure everything goes together smoothly.