greenhorn

My son and I are really new to fishing and trying to get educated. We were on the lake the other day and ask one boat what worked at this time of year. Kindly, they answered that Bass should be biting on jigs, "drop shot" and "split shot". Jigs I know, but I'm wondering what was meant by drop shot and split shot. I know I should have asked, but my pride interfered as I didn't want to seem too new. Can anyone help? We're generally boat fishing on Castaic Lake and would appreciate any pointers you might offer. Thanks a lot!