You want to use "it's like" sometimes to compare things that are not similar and sometimes to compare things that are similar.

你可以用这个句型来比较相似或者完全不同的东西。

It's like 课堂 - SpeakingMax英语口语达人

So, "It's like" is good in comparing an object, person, place or thing to something else.

所以，“It's like”句型在比较物体、人物、地点与事物的时候非常有用。

It's like 课堂 - SpeakingMax英语口语达人