Transmission line model VS lumped parameters models
A lumped parameter model uses R, L and C components connected together at nodes. Nodes have zero electrical length, zero capacitance to ground, and so enforce the same voltage at all times at all component terminals connected to them, and a net current flow of zero into that node. We often show nodes on schematics as wires. At low frequencies, and for short wires, we will often approximate real wires in a circuit as nodes.
A transmission line model uses R, L and C components connected together with transmission lines. These lines have distributed capacitance to ground, and a distributed inductance. At high frequencies, and for long wires, real wires are better approximated by transmission lines. The voltage at each end of a line can be different, and the total current into both ends of a line need not be zero, a signal will take a finite time to travel from one end of the line to the other.
For limited frequency ranges, for either conceptual or simulation convenience, we can approximate a transmission line as a cascade of LC sections, and add shunt or series R to the sections if we want to simulate losses.