I found out cracks in my bicycle tyre. I am not sure if the tyre is damaged. Following is a picture for reference I would like to know what can be the possible causes for these cracks and how to avoid them.
It is not ideal, the tyre is approaching end of life, but the tube is unlikely to burst through that crack because the structural part of the tyre (the threads) still there and are still somewhat protected from the weather.
Do plan on replacing it, but you should get at least months or more of riding. Basically wear the tread out some more then replace both tyres.
I'd say, it's time to replace the tire. It doesn't really matter what caused it - could have been low quality, age, or extended use. The cracks mean the layers the tire is made of are separating and in the long run you will see more punctures because the material is softening. A brand-name tire costs 15 to 25 EUR/USD/GBP which I consider low enough to not take the risk of punctures.
For the record, that is called "Dry Rot", and it's caused by rubber drying out and getting less pliable. Commonly happens when a bike is on a concrete floor not being used(like in a garage or storage shed) for a long period of time. It will make your tire brittle, and sometimes will make it unsafe. A little dry rot usually isn't detrimental, a lot can split the sidewall of the tire causing a blowout. Yes, you should change the tire.