Research and list 5 popular smartphone apps
1. WhatsApp: This is a popular messaging app and is used by millions of people for instant messaging, voice and video calls, as well as sharing files and media.

2. TikTok: This is a social media platform that allows users to create, share and discover short-form videos, and has become a cultural phenomenon amongst teenagers and young adults.

3. Instagram: This is another social media app that enables users to share photos and videos, as well as to interact with others through comments, likes, and direct messaging.

4. Uber: This is a ride-sharing app that allows users to quickly and easily request a ride, set their pick-up and drop-off locations, and pay for the trip through the app.

5. Spotify: This is a music streaming app that gives users access to a vast library of music, as well as curated playlists, podcasts, and the ability to create their own custom playlists.
Complete the following task based on the instruction and optional input provided.### Instruction:
Research and list 5 popular smartphone apps

### Output:
1. WhatsApp: This is a popular messaging app and is used by millions of people for instant messaging, voice and video calls, as well as sharing files and media.

2. TikTok: This is a social media platform that allows users to create, share and discover short-form videos, and has become a cultural phenomenon amongst teenagers and young adults.

3. Instagram: This is another social media app that enables users to share photos and videos, as well as to interact with others through comments, likes, and direct messaging.

4. Uber: This is a ride-sharing app that allows users to quickly and easily request a ride, set their pick-up and drop-off locations, and pay for the trip through the app.

5. Spotify: This is a music streaming app that gives users access to a vast library of music, as well as curated playlists, podcasts, and the ability to create their own custom playlists.