title: What are series and bucket in InfluxDb
body: <p>While trying to understand different concepts of InfluxDb I came across <a href="https://docs.influxdata.com/influxdb/v1.7/concepts/crosswalk/" rel="noreferrer">this</a> documentation, where there is a comparision of terms with SQL database.  </p>
  
  <blockquote>
    <p>An InfluxDB measurement is similar to an SQL database table.<br>
    InfluxDB tags are like indexed columns in an SQL database.<br>
     InfluxDB fields are
    like unindexed columns in an SQL database.<br>
     InfluxDB points are similar
    to SQL rows.</p>
  </blockquote>
  
  <p>But there are couple of other terminology which I came across, which I could not clearly understand and wondering if there is an SQL equivalent for that. </p>
  
  <p><strong>Series</strong><br>
  <strong>Bucket</strong></p>
  
  <p>From what I understand from the documentation</p>
  
  <blockquote>
    <p>series is the collection of data that share a retention policy,
    measurement, and tag set.</p>
  </blockquote>
  
  <p>Does this mean a series is a subset of data in a database table? Or is it like database views ?<br>
   I could not see any documentation explaining buckets. I guess this is a new concept in 2.0 release</p>
  
  <p>Can someone please clarify these two concepts. </p>