Instagram was originally distinguished by allowing content to be framed only in a square (1:1) aspect ratio of 640 pixels to match the display width of the iPhone at the time. In 2015, this restriction was eased with an increase to 1080 pixels. It also added messaging features, the ability to include multiple images or videos in a single post, and a Stories feature- similar to its main competitor Snapchat – which allowed users to post their content to a sequential feed, with each post accessible to others for 24 hours. As of January 2019, Stories is used by 500 million people daily.

The company’s milestones:

2010 – Instagram is a photo and video-sharing social media application that was launched in 2010 by Kevin Systrom.

October 6, 2010 – The Instagram iOS app was officially released through the App Store.

January 2011 – Instagram introduces hashtags on the platform.

April 3, 2012 – Instagram released a version of its app for Android phones, and it was downloaded more than one million times in less than one day.

April 9, 2012 – Facebook announces they are buying Instagram for 1 billion dollars.

November 2012 –  Instagram launched website profiles, allowing anyone to see user feeds from a web browser with limited functionality,[42] as well as a selection of badges, web widget buttons to link to profiles.

March 2014 – Instagram started to test and switch the technology to use Facebook Places.

February 2013 – Instagram hits 100 million monthly active users.

September 2015 – Instagram ads launch globally.

March 15, 2016 – Instagram announces the feed is changing from chronological to algorithmic.

August 2, 2016 – Instagram announces ‘Stories’.

February 22, 2017 – Instagram launches carousel posts allowing multiple photos or videos in a single post.

Jun 20, 2018 – Instagram announces it has 1 billion users.

March 2020  – Instagram launched a new feature called “Co-Watching”. The new feature allows users to share posts with each other over video calls. According to Instagram, they pushed forward the launch of Co-Watching in order to meet the demand for virtually connecting with friends and family due to social distancing as a result of the COVID-19 pandemic.

August 2020 – Instagram began a pivot to video, introducing a new feature called “Reels”. The intent was to compete with the video-sharing site TikTok.

March 1, 2021 – Instagram launched a new feature named Instagram Live “Rooms” Let Four People Go Live Together.

February 2023 –  Instagram introduced a new feature allowing users to browse and post GIFs in the comments.

According to; Source of photos: internet