Feats in Dungeons and Dragons 5e

In Dungeons and Dragons fifth edition feats are an optional rule used by most Dungeon Masters. A feat is a representation of experience and prowess of a character that goes beyond that of normal class or race progression.
Feats can be gained in place of the Ability Score Improvement feature granted at certain class levels. Some things to keep in mind about feats. Unless the feat’s description says otherwise,  you can take each feat only once. Prerequisite specified in a feat must be meet in order to take that feat. If for any reason you no longer meet a feats Prerequisite you can not use that feat, until you regain the prerequisite.

How Many Feats are There?

As of now there are a total of 60 official feats for Dungeons and Dragons 5e. The Player’s Handbook contains 42 feats. Xanathar’s Guide to Everything has 15 feats. Eberron: Rising From the Last War has 2. Mordenkainen’s Tome of Foes and Elemental Evil Player’s Companion both have the same single feat.
This does not include any Unearthed Arcana or the Expanded Racial Feats that where available for pre-order of Xanathar’s Guide to Everything witch had another 16 or so feats.

Feats in Your Game

Feat usages is up to the Dungeon Master in all games. There are lots of homebrew feats available for use over at DMs Guild adding some flare to the game is fun and making things your own is even better.
I am still working out my own Custom Fest System that I use in my games.
In conclusion feats add flare to any Dungeon and Dragon game and there are a wild assortments of feats that can be added. Be it homebrew or source.