If a time series has a trend and seasonality,the simple exponential smoothing model is the most appropriate model to be used for forecasting.

Simple Exponential Smoothing Model

A forecasting technique that applies smoothing constants to previous observations, typically used for time series data without trend or seasonality.

Trend

A general direction in which something is developing or changing, often identified in data analysis or market movements.

Seasonality

The occurrence of variations that repeat at specific regular intervals less than a year, often influenced by the calendar or weather.