A listicle is an article organised as a numbered list: "best tools", "top alternatives", "apps we recommend". In software and ecommerce, they're where many buyers start their research.
They're good outreach targets because they already link to products like yours, they're updated regularly, and the author is used to adding new entries.
The pitches that work name a specific entry or section and explain which readers your product suits better than what's already listed.
Example
"The 9 best note-taking apps for researchers" is a listicle Margin could pitch.
Putting it into practice
Where to use it: Listicle inclusion email template and How to get listed in best-of articles. For the longer version, read how SaaS products earn links from listicles.