Social media marketing helps businesses to increase your return on investment, as the cost of advertising on these social media forums is often less than the return, giving you more revenue.
Because you use digital marketing, you can reach hundreds and thousands of people by simply targeting ads, reducing your advertisement costs.
Facebook and Instagram help you in attracting your potential buyers, and at the same time, they aim to keep the potential customers engaged on their specific social media networks so that you and they both can benefit from this.
This increased user time on their social media networks increases the possibility of users seeing your ad or your profile, and therefore visiting your profile and then eventually becoming buyers.