Welcome to the world of the steel bar!
A lap steel is electric. Looks like a 2x4 with strings and a pickup. Here's a picture of my 1948 Gibson BR9 lap steel
A resonator is often called a Dobro, but Dobro is a brand of resonator (like Gibson, Martin, and Taylor are brands of acoustic guitars). A resonator can have a wood body or a metal body, a round neck that you play like a normal guitar, or a square neck that you play with the guitar laying on your lap.
Here's a picture of my 1980 square neck RQ Jones. RQ Jones is a great vintage resonator.
And the all metal guitar in the center is a square neck Dobro I bought new in 1976 for $350.
