I was reading a sample code, and I don't understand what the tag <Container> does here.

<Container maxWidth="lg">
  <AppBar className={classes.appBar} position="static" color="inherit">
    <Typography className={classes.heading} variant="h2" align="center">Memories</Typography>
    <img className={classes.image} src={memories} alt="icon" height="60" />
  </AppBar>
  <Grow in>
<Container>
^^^^^^^^^^^

I looked it up, and results are all about contianer tags in HTML and functions in js, which doesn't include a tag that looks like <Container>. It seems that I can't either search the word <Container> , google search just ignores the symbols <>. I don't know how to counter that.