Afterlife

I have a co-worker who asks me many questions about Judaism. One morning when he came to work he told me his children asked him why they have to go to church. He didn't know what to tell them. He said an honest answer would have been, "Go to church so you won't go to Hell." But he didn't know if he should be so blunt with his young children. Then, he suddenly looked at me and asked, "What would you tell your children? Don't Jews believe in Hell?" I said that I had never been taught the concept in my religious education and had never heard it discussed in the synagogue. I was taught that Judaism emphasizes this world we live in right now. So, Rabbi, does Judaism believe in Hell?