The difference between periodic inventory and perpetual inventory

The difference between periodic inventory and perpetual inventory? 

periodic inventory 

The purchases account is used in the accounts and the beginning and the end of the period merchandise account is used 

Accounting restrictions in Afaky accounting program in case of purchase:

From h / purchases to h / supplier - bank - fund 

Accounting restrictions in case of sale:

From h / the customer - the bank - the fund ...... to h / sales 

Continuous inventory

 The inventory account is used, not the purchases, and the cost of sales account is used in the accounts, and neither the beginning nor the end of the period merchandise accounts are used 

Accounting restrictions in Afaky accounting program in case of purchase:

 From h / stock to h / supplier - bank - fund

Accounting restrictions in case of sale:

 From h / customer - bank - fund ... to h / sales 

From h / cost of sales to h / inventory 

The use of continuous inventory allows to know the stock valuation and the cost of items at any time, unlike the periodic inventory, where the stock valuation is known in the case of the actual inventory of stores.