It's used in the same way as "for example" or "for instance" in English.
Here are some examples:
* "Halimbawa, ang mga mansanas ay isang uri ng prutas." (For example, apples are a type of fruit.)
* "Marami akong halimbawa ng magagandang tula." (I have many examples of beautiful poems.)
* "Maaari kang gumamit ng halimbawa upang ipaliwanag ang iyong ideya." (You can use an example to explain your idea.)