Curry powder is a blend of spices used to give curries their characteristic taste. You can find it in the spice isle of any grocery store. Each brand has a different blend, but they mainly consist of some mixture of coriander, turmeric, cumin, fenugreek, and red pepper, with additional spices mixed in.
The most popular Japanese brand is S&B as pictured, but if you can’t find it in an international grocery store, you can just use McCormick instead. ;D If you’re feeling adventurous, you can even make your own curry powder blend!Buy on Amazon