You can embed a twitter profile with tweets using the Jetpack Twitter widget. But you can also embed a tweet or timeline by pasting the link to the tweet into a post or page.
You need to have the Jetpack plugin activated and turn on it’s shortcode module. You only need to paste a link to a tweet.
You can even control the amount of space that the tweet(s) take up by using a shortcode:
[twitter-timeline username=glowscot height=300 width=600 ]
gives:Tweets by @glowscot