A complete ionic equation is a chemical equation where all reactants and products are represented as dissociated ions if they are strong electrolytes.
A substance that produces an electrically conducting solution when dissolved in water. It's like a charismatic student who can energize the whole crowd when they start speaking.
The substance that dissolves another to form a solution. Like the school principal, who brings everyone together for an assembly.
The substance that gets dissolved in a solvent. This could be compared to any individual student who blends into the larger group during an assembly.