Given information
When a bunch of resistance is connected side by side to each other such that one end of a resistance is connected to one end of any other resistance, and so on. Then the connection is called a series connection.
When in a circuit, endpoints of a bunch of resistance are connected together and the same occurs for the beginning points, leading to exactly two electrically common points, then the connection is called a parallel connection.
Step-by-step explanation
For series connection the flow of current through each of the resistance is same, while the voltage differs. In parallel connection the voltage across all the components is the same, however the current flow differs.
When the Christmas tree lights are connected in series, if one of any lights burns out, then the whole system goes off and we cannot easily identify which one from the series burns out.
But in case of parallel connection if one light burns out, it won't make the whole system off. And we can easily identify which one goes off.
Thus, it is preferable to use parallel connection over series connection, keeping this advantage in mind.
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