What is the most important concept of time series analysis?

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One fundamental idea is, a time series is a time sequences ordered collection of information, taken systematically and preferably at equal time periods. Sometimes, any information point at time t, relies or correlated with the facts point at t-1. The collection primarily based on such records are the “Autocorrelated” time collection. The main targets in one of these statistics series and its evaluation are,

1. To study the Trends in the data, if any.
2. To Predict, Project or Forecast future or unknown values of the series.
3. To study the Error or the Random Noise present in the data and identify its causes.
4. In case, it is a Stochastic Process , I.e. each value has a probability of occurrence, then the series needs to be identified as whether it is a Stationary or Non-Stationary process.