Hi @Lauraa we introduced tiered membership plans earlier this year, all members were emailed when this was launched. The plans are Classic, Standard and Premium with the Premium Membership shown on the profile and listings of members who upgrade to that tier. This blog post explains the tiers and all of the additional benefits
It has also been discussed here on the forum a number of times, you can find out more here Questions About The New Tiered Memberships - Previously Posted In Favourites Topic