When a comma is needed after "such as":
* When introducing a list of examples:
* "I like fruits, such as apples, oranges, and bananas."
* "There are many types of birds, such as robins, cardinals, and owls."
When a comma is NOT needed after "such as":
* When "such as" is followed by a single example or a short, closely related phrase:
* "I like fruits, such as apples."
* "She's interested in sports, such as basketball."
Key point: The comma is used to separate the introductory phrase ("such as" and the examples) from the rest of the sentence. If the list of examples is short and flows seamlessly with the rest of the sentence, the comma might not be necessary.
Ultimately, it's about clarity and readability. If adding a comma improves the sentence's flow and avoids confusion, then use it!