What is a SeqView in Scala

WhatIsASeqView.scala

scala> val seq = (1 to 10000000).view.filter(_ % 2 == 0).map(x => x+1)
seq: scala.collection.SeqView[Int,Seq[_]] = SeqViewFM(...)

scala> seq.take(10)
res0: scala.collection.SeqView[Int,Seq[_]] = SeqViewFMS(...)

scala> seq.take(10).force
res1: Seq[Int] = Vector(3, 5, 7, 9, 11, 13, 15, 17, 19, 21)

scala> val seq = (1 to 10000000).filter(_ % 2 == 0).map(x => x+1)
java.lang.OutOfMemoryError: Java heap space
  at java.lang.Integer.valueOf(Integer.java:832)
  at scala.runtime.BoxesRunTime.boxToInteger(BoxesRunTime.java:65)
  at $anonfun$2.apply(<console>:10)
  at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
  at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
  at scala.collection.Iterator$class.foreach(Iterator.scala:742)
  at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)
  at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
  at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
  at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)
  at scala.collection.AbstractTraversable.map(Traversable.scala:104)
  ... 21 elided