Hi Radha,
You can find the official documentation here: https://confluence.atlassian.com/jirasoftwarecloud/burndown-chart-777002653.html
That's a first place to have a great intro. I would also recommend to have more reading about Agile reporting in general if you're not comfortable with them (and there are so many of them, I can feel you). The Burndown chart is pretty standard using Scrum, if you're new to Scrum you might even want to ask your company for a training, shifting to Agile is a tough change management! Basically Burndown is showing two series on a graph: one is the "perfect" trend (starting at a value defined by the whole Sprint estimation aggregated and getting to 0 remaining at the end. That's the trend you'll try to follow. The red line is the real remaining based on your progression during the sprint (when issues are completed, their estimation is deduced from Sprint global estimation). In other words it's a chart meant to display your progression against the Sprint Objectives.
I've seen many questions from you those last days and while Community is the perfect place to hear from your peers, don't forget to have some readings and get onboarded by your company peers as well: they definitely know a lot more about your context than we'll ever do! Don't be shy to ask for Jira training as well if you can get some, that's a great way to improve your skills, can also be quicker than waiting for our answers :)
Have a great and safe trip with Jira!
Cheers
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